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20857680564 = 22371951127271
BaseRepresentation
bin10011011011001101…
…101111001010110100
31222211121101221210120
4103123031233022310
5320204031234224
613325404251540
71335605234220
oct233315571264
958747357716
1020857680564
118933687136
124061240bb0
131c752a4b26
14101c187780
158211d8779
hex4db36f2b4

20857680564 has 48 divisors (see below), whose sum is σ = 55649427456. Its totient is φ = 5956236000.

The previous prime is 20857680563. The next prime is 20857680583. The reversal of 20857680564 is 46508675802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857680563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100249 + ... + 227519.

It is an arithmetic number, because the mean of its divisors is an integer number (1159363072).

Almost surely, 220857680564 is an apocalyptic number.

It is an amenable number.

20857680564 is an abundant number, since it is smaller than the sum of its proper divisors (34791746892).

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

20857680564 is a wasteful number, since it uses less digits than its factorization.

20857680564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129236 (or 129234 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 20857680564 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, five hundred sixty-four".

Divisors: 1 2 3 4 6 7 12 14 21 28 42 84 1951 3902 5853 7804 11706 13657 23412 27314 40971 54628 81942 127271 163884 254542 381813 509084 763626 890897 1527252 1781794 2672691 3563588 5345382 10690764 248305721 496611442 744917163 993222884 1489834326 1738140047 2979668652 3476280094 5214420141 6952560188 10428840282 20857680564