20503456656 has 40 divisors (see below), whose sum is σ = 52973960640. Its totient is φ = 6833621376.

The previous prime is 20503456627. The next prime is 20503456667. The reversal of 20503456656 is 65665430502.

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, 439710 + ... + 484098.

It is an arithmetic number, because the mean of its divisors is an integer number (1324349016).

Almost surely, 2^20503456656 is an apocalyptic number.

It is an amenable number.

20503456656 is an abundant number, since it is smaller than the sum of its proper divisors (32470503984).

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

20503456656 is a wasteful number, since it uses less digits than its factorization.

20503456656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54023 (or 54017 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 20503456656 in words is "twenty billion, five hundred three million, four hundred fifty-six thousand, six hundred fifty-six".