Rahul Sharma (Editor)

20000 (number)

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← 19999
  
20000

Cardinal
  
twenty thousand

Roman numeral
  
XX

20000
  
20001 →

Factorization
  
2× 5

Ordinal
  
20000th (twenty thousandth)

20 000 (twenty thousand) is the natural number that comes after 19,999 and before 20,001.

Selected numbers in the range 20000–29999

  • 20000 – round number; also in the title of Jules Verne's novel Twenty Thousand Leagues Under the Sea
  • 20081 – Motorola 68K instruction for no operation (NOP)
  • 20100 – sum of the first 200 natural numbers (hence a triangular number)
  • 20160 – highly composite number; the smallest order belonging to two non-isomorphic simple groups: the alternating group A8 and the Chevalley group A2(4)
  • 20161 – the largest integer that cannot be expressed as a sum of two abundant numbers
  • 20230 – pentagonal pyramidal number
  • 20412 – Leyland number: 93 + 39
  • 20540 – square pyramidal number
  • 20569 – tetranacci number
  • 20736 – 124, 1000012, palindromic in base 15 (622615)
  • 20903 – first prime of form 120k + 23 that is not a full reptend prime
  • 21025 – 1452, palindromic in base 12 (1020112)
  • 21147 – Bell number
  • 21181 – the least of five remaining Seventeen or Bust numbers in the Sierpiński problem
  • 21856 – octahedral number
  • 21952 – 283
  • 21978 – reverses when multiplied by 4: 4 × 21978 = 87912
  • 22050 – pentagonal pyramidal number
  • 22140 – square pyramidal number
  • 22222 – Kaprekar number: 222222 = 493817284, 4938 + 17284 = 22222
  • 22447 – cuban prime
  • 22527 – Woodall number: 11 × 211 − 1
  • 22699 – one of five remaining Seventeen or Bust numbers in the Sierpiński problem
  • 23401 – Leyland number: 65 + 56
  • 23409 – sum of the cubes of the first 17 positive integers
  • 23497 – cuban prime
  • 23821 – square pyramidal number
  • 23969 – octahedral number
  • 23976 – pentagonal pyramidal number
  • 24211 – Zeisel number
  • 24336 – 1562, palindromic in base 5: 12343215
  • 24389 – 293
  • 24571 – cuban prime
  • 24601 – Jean Valjean's prisoner number in Les Misérables
  • 24631 – Wedderburn-Etherington number
  • 24649 – 1572, palindromic in base 12: 1232112
  • 24737 – one of five remaining Seventeen or Bust numbers in the Sierpinski problem
  • 25011 – the first composite number that in base 10 remains composite after any insertion of a digit
  • 25085 – Zeisel number
  • 25117 – cuban prime
  • 25200 – highly composite number
  • 25205 – largest number whose factorial is less than 10100000
  • 25585 – square pyramidal number
  • 26214 – octahedral number
  • 26227 – cuban prime
  • 26861 – smallest number below which there are more primes of the form 4k + 1 than of the form 4k + 3, against Chebyshev's bias
  • 26896 – 1642, palindromic in base 9: 408049
  • 27000 – 303
  • 27434 – square pyramidal number
  • 27559 – Zeisel number
  • 27648 – 11 × 22 × 33 × 44
  • 27720 – highly composite number; smallest number divisible by the numbers 1 to 12 (there is no smaller number divisible by the numbers 1 to 11)
  • 27846 – harmonic divisor number
  • 28158 – pentagonal pyramidal number
  • 28374 – smallest integer to start a run of six consecutive integers with the same number of divisors
  • 28561 – 134, 1192 + 1202, number that is simultaneously a square number and a centered square number, palindromic in base 12: 1464112
  • 28595 – octahedral number
  • 28657 – Fibonacci number, Markov number
  • 28900 – 1702, palindromic in base 13: 1020113
  • 29241 – sum of the cubes of the first 18 positive integers
  • 29341 – Carmichael number
  • 29370 – square pyramidal number
  • 29791 – 313

    • References

    20000 (number) Wikipedia
    (Text) CC BY-SA


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