20880964 has 72 divisors (see below), whose sum is σ = 44271360. Its totient is φ = 8566272.

The previous prime is 20880961. The next prime is 20880967. The reversal of 20880964 is 46908802.

It is an interprime number because it is at equal distance from previous prime (20880961) and next prime (20880967).

It is not an unprimeable number, because it can be changed into a prime (20880961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264277 + ... + 264355.

It is an arithmetic number, because the mean of its divisors is an integer number (614880).

Almost surely, 2^20880964 is an apocalyptic number.

It is an amenable number.

20880964 is an abundant number, since it is smaller than the sum of its proper divisors (23390396).

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

20880964 is a wasteful number, since it uses less digits than its factorization.

20880964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20880964 is about 4569.5693451353. The cubic root of 20880964 is about 275.3701417970.

The spelling of 20880964 in words is "twenty million, eight hundred eighty thousand, nine hundred sixty-four".