20565610165056 has 112 divisors (see below), whose sum is σ = 59363561963520. Its totient is φ = 6231611205120.

The previous prime is 20565610165049. The next prime is 20565610165073. The reversal of 20565610165056 is 65056101656502.

It is a super-2 number, since 2×20565610165056² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 20565610164996 and 20565610165014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34209985 + ... + 34805951.

Almost surely, 2^{20565610165056} is an apocalyptic number.

It is an amenable number.

20565610165056 is an abundant number, since it is smaller than the sum of its proper divisors (38797951798464).

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

20565610165056 is a wasteful number, since it uses less digits than its factorization.

20565610165056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612332 (or 612322 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 48.

The spelling of 20565610165056 in words is "twenty trillion, five hundred sixty-five billion, six hundred ten million, one hundred sixty-five thousand, fifty-six".