20646672 has 20 divisors (see below), whose sum is σ = 53337360. Its totient is φ = 6882208.

The previous prime is 20646667. The next prime is 20646707. The reversal of 20646672 is 27664602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215022 + ... + 215117.

It is an arithmetic number, because the mean of its divisors is an integer number (2666868).

Almost surely, 2^20646672 is an apocalyptic number.

It is an amenable number.

20646672 is an abundant number, since it is smaller than the sum of its proper divisors (32690688).

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

20646672 is a wasteful number, since it uses less digits than its factorization.

20646672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430150 (or 430144 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20646672 is about 4543.8609133643. The cubic root of 20646672 is about 274.3363479192.

The spelling of 20646672 in words is "twenty million, six hundred forty-six thousand, six hundred seventy-two".