20556865502 has 16 divisors (see below), whose sum is σ = 30900728880. Its totient is φ = 10256640192.

The previous prime is 20556865489. The next prime is 20556865517.

20556865502 is nontrivially palindromic in base 10.

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, 4660274 + ... + 4664682.

It is an arithmetic number, because the mean of its divisors is an integer number (1931295555).

Almost surely, 2^20556865502 is an apocalyptic number.

20556865502 is a deficient number, since it is larger than the sum of its proper divisors (10343863378).

20556865502 is a wasteful number, since it uses less digits than its factorization.

20556865502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8827.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 20556865502 in words is "twenty billion, five hundred fifty-six million, eight hundred sixty-five thousand, five hundred two".