20556057056 has 48 divisors (see below), whose sum is σ = 40736863440. Its totient is φ = 10210314240.

The previous prime is 20556057043. The next prime is 20556057083. The reversal of 20556057056 is 65075065502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9654200 + ... + 9656328.

It is an arithmetic number, because the mean of its divisors is an integer number (848684655).

Almost surely, 2^20556057056 is an apocalyptic number.

It is an amenable number.

20556057056 is a deficient number, since it is larger than the sum of its proper divisors (20180806384).

20556057056 is a wasteful number, since it uses less digits than its factorization.

20556057056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 41.

The spelling of 20556057056 in words is "twenty billion, five hundred fifty-six million, fifty-seven thousand, fifty-six".