20885964 has 24 divisors (see below), whose sum is σ = 53164608. Its totient is φ = 6329040.

The previous prime is 20885939. The next prime is 20885981. The reversal of 20885964 is 46958802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78982 + ... + 79245.

It is an arithmetic number, because the mean of its divisors is an integer number (2215192).

Almost surely, 2^20885964 is an apocalyptic number.

It is an amenable number.

20885964 is an abundant number, since it is smaller than the sum of its proper divisors (32278644).

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

20885964 is a wasteful number, since it uses less digits than its factorization.

20885964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158245 (or 158243 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20885964 is about 4570.1164098959. The cubic root of 20885964 is about 275.3921194035.

The spelling of 20885964 in words is "twenty million, eight hundred eighty-five thousand, nine hundred sixty-four".