20000 (عدد)

20000 (عدد) یعنی 20,000 (عدد) ایک عدد اور ایک علامت ہے۔ کچھ عددی نظاموں میں 19,999 سے بڑا یا زیادہ اور 20,001 سے چھوٹا یا کم ہوتا ہے۔ گنتی میں اسے بیس ہزار بولا جاتا ہے۔ اور اس سے پہلے انیس ہزار نو سو نینانوے اور اس کے بعد بیس ہزار ایک بولا جاتا ہے۔

 20000 تا 29999 کے خاص اعداد 
 20000 – round number; also in the title of جولس ورن'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 زائد عددs
 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 120k+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 بدنصیب (ناول)
 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

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