20879656 has 32 divisors (see below), whose sum is σ = 45699840. Its totient is φ = 8756928.

The previous prime is 20879633. The next prime is 20879707. The reversal of 20879656 is 65697802.

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, 1335 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (1428120).

Almost surely, 2^20879656 is an apocalyptic number.

It is an amenable number.

20879656 is an abundant number, since it is smaller than the sum of its proper divisors (24820184).

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

20879656 is a wasteful number, since it uses less digits than its factorization.

20879656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993 (or 7989 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20879656 is about 4569.4262221859. The cubic root of 20879656 is about 275.3643918763.

The spelling of 20879656 in words is "twenty million, eight hundred seventy-nine thousand, six hundred fifty-six".