20885807964 has 48 divisors (see below), whose sum is σ = 56400512000. Its totient is φ = 5891835456.

The previous prime is 20885807951. The next prime is 20885808017. The reversal of 20885807964 is 46970858802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1567039 + ... + 1580310.

Almost surely, 2^20885807964 is an apocalyptic number.

It is an amenable number.

20885807964 is an abundant number, since it is smaller than the sum of its proper divisors (35514704036).

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

20885807964 is a wasteful number, since it uses less digits than its factorization.

20885807964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147442 (or 3147440 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 20885807964 in words is "twenty billion, eight hundred eighty-five million, eight hundred seven thousand, nine hundred sixty-four".