20620515164 has 12 divisors (see below), whose sum is σ = 36307288584. Its totient is φ = 10247004144.

The previous prime is 20620515107. The next prime is 20620515173. The reversal of 20620515164 is 46151502602.

It is a self number, because there is not a number n which added to its sum of digits gives 20620515164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15812627 + ... + 15813930.

It is an arithmetic number, because the mean of its divisors is an integer number (3025607382).

Almost surely, 2^20620515164 is an apocalyptic number.

It is an amenable number.

20620515164 is a deficient number, since it is larger than the sum of its proper divisors (15686773420).

20620515164 is a wasteful number, since it uses less digits than its factorization.

20620515164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31626724 (or 31626722 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 20620515164 in words is "twenty billion, six hundred twenty million, five hundred fifteen thousand, one hundred sixty-four".