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20649679200 = 2532522868011
BaseRepresentation
bin10011001110110100…
…010001100101100000
31222022010000101120100
4103032310101211200
5314242304213300
613253014142400
71330501243233
oct231664214540
958263011510
1020649679200
118837229687
124003651a00
131c411788b7
14ddc6c141a
1580cced700
hex4ced11960

20649679200 has 108 divisors (see below), whose sum is σ = 72815956668. Its totient is φ = 5506579200.

The previous prime is 20649679147. The next prime is 20649679201. The reversal of 20649679200 is 297694602.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649679201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1426806 + ... + 1441205.

It is an arithmetic number, because the mean of its divisors is an integer number (674221821).

Almost surely, 220649679200 is an apocalyptic number.

20649679200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20649679200 is an abundant number, since it is smaller than the sum of its proper divisors (52166277468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20649679200 is a wasteful number, since it uses less digits than its factorization.

20649679200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868037 (or 2868021 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 20649679200 in words is "twenty billion, six hundred forty-nine million, six hundred seventy-nine thousand, two hundred".

Divisors: 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 30 32 36 40 45 48 50 60 72 75 80 90 96 100 120 144 150 160 180 200 225 240 288 300 360 400 450 480 600 720 800 900 1200 1440 1800 2400 3600 7200 2868011 5736022 8604033 11472044 14340055 17208066 22944088 25812099 28680110 34416132 43020165 45888176 51624198 57360220 68832264 71700275 86040330 91776352 103248396 114720440 129060495 137664528 143400550 172080660 206496792 215100825 229440880 258120990 275329056 286801100 344161320 412993584 430201650 458881760 516241980 573602200 645302475 688322640 825987168 860403300 1032483960 1147204400 1290604950 1376645280 1720806600 2064967920 2294408800 2581209900 3441613200 4129935840 5162419800 6883226400 10324839600 20649679200