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20,000 (twenty thousand) is the natural number that comes after 19,999 and before 20,001. ==Selected numbers== * 20000 – round number; also in the title of Jules Verne's novel ''20,000 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 ''A''2(4) * 20161 – the largest integer that cannot be expressed as a sum of two abundant numbers * 20230 – pentagonal pyramidal number * 20412 – Leyland number * 20540 – square pyramidal number * 20569 – tetranacci number * 20736 – 124, 1000012, palindromic in base 15 (622615) * 20903 – first prime of form 120''k''+23 that is ''not'' a full reptend prime * 21025 – 1452, palindromic in base 12 (1020112 * 21147 – Bell number * 21181 – one of six remaining Seventeen or Bust numbers in the Sierpinski problem * 21856 – octahedral number * 21952 – 283 * 21978 – reverses when multiplied by 4 * 22050 – pentagonal pyramidal number * 22140 – square pyramidal number * 22222 – Kaprekar number * 22447 – cuban prime * 22527 – Woodall number * 22699 – one of six remaining Seventeen or Bust numbers in the Sierpinski problem * 23401 – Leyland number * 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 Miserables * 24631 – Wedderburn-Etherington number * 24649 – 1572, palindromic in base 12: 1232112 * 24737 – one of six 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 * 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「20000 (number)」の詳細全文を読む スポンサード リンク
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