Template:HAZMAT Class 6 Packing Groups
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Template:Infobox number 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 A2(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 - 12^4, 1000012
- 20903 – first prime of form 120k+23 that is not a full reptend prime
- 21147 – Bell number
- 21181 – one of six remaining Seventeen or Bust numbers in the Sierpinski problem
- 21856 – octahedral number
- 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
- 24571 – cuban prime
- 24601 – Jean Valjean's prisoner number in Les Miserables
- 24631 – Wedderburn-Etherington number
- 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
- 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 – , number that is simultaneously a square number and a centered square number
- 28595 – octahedral number
- 28657 – Fibonacci number, Markov number
- 29241 – sum of the cubes of the first 18 positive integers
- 29341 – Carmichael number
- 29370 – square pyramidal number