20620664165 has 32 divisors (see below), whose sum is σ = 27978255360. Its totient is φ = 14507136000.

The previous prime is 20620664143. The next prime is 20620664203. The reversal of 20620664165 is 56146602602.

It is not a de Polignac number, because 20620664165 - 2⁸ = 20620663909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58511 + ... + 211340.

It is an arithmetic number, because the mean of its divisors is an integer number (874320480).

Almost surely, 2^20620664165 is an apocalyptic number.

It is an amenable number.

20620664165 is a deficient number, since it is larger than the sum of its proper divisors (7357591195).

20620664165 is a wasteful number, since it uses less digits than its factorization.

20620664165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269933.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 20620664165 in words is "twenty billion, six hundred twenty million, six hundred sixty-four thousand, one hundred sixty-five".