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20857715088 = 2437311199603
BaseRepresentation
bin10011011011001101…
…110111100110010000
31222211121110201011020
4103123031313212100
5320204033340323
613325405115440
71335605436660
oct233315674620
958747421136
1020857715088
118933700071
124061258b80
131c752b7762
14101c1961a0
158211e3ae3
hex4db377990

20857715088 has 80 divisors (see below), whose sum is σ = 61778236416. Its totient is φ = 5940155520.

The previous prime is 20857715077. The next prime is 20857715093. The reversal of 20857715088 is 88051775802.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20857715088.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4695 + ... + 204297.

Almost surely, 220857715088 is an apocalyptic number.

20857715088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857715088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30889118208).

20857715088 is an abundant number, since it is smaller than the sum of its proper divisors (40920521328).

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

20857715088 is a wasteful number, since it uses less digits than its factorization.

20857715088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199932 (or 199926 counting only the distinct ones).

The product of its (nonzero) digits is 1254400, while the sum is 51.

The spelling of 20857715088 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, eighty-eight".

Divisors: 1 2 3 4 6 7 8 12 14 16 21 24 28 42 48 56 84 112 168 311 336 622 933 1244 1866 2177 2488 3732 4354 4976 6531 7464 8708 13062 14928 17416 26124 34832 52248 104496 199603 399206 598809 798412 1197618 1397221 1596824 2395236 2794442 3193648 4191663 4790472 5588884 8383326 9580944 11177768 16766652 22355536 33533304 62076533 67066608 124153066 186229599 248306132 372459198 434535731 496612264 744918396 869071462 993224528 1303607193 1489836792 1738142924 2607214386 2979673584 3476285848 5214428772 6952571696 10428857544 20857715088