20646864602 has 32 divisors (see below), whose sum is σ = 38494721664. Its totient is φ = 8087112000.

The previous prime is 20646864587. The next prime is 20646864607.

20646864602 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (20646864607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543224 + ... + 579987.

It is an arithmetic number, because the mean of its divisors is an integer number (1202960052).

Almost surely, 2^20646864602 is an apocalyptic number.

20646864602 is a deficient number, since it is larger than the sum of its proper divisors (17847857062).

20646864602 is a wasteful number, since it uses less digits than its factorization.

20646864602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123334.

The product of its (nonzero) digits is 663552, while the sum is 44.

The spelling of 20646864602 in words is "twenty billion, six hundred forty-six million, eight hundred sixty-four thousand, six hundred two".