20215872 has 56 divisors (see below), whose sum is σ = 59436000. Its totient is φ = 6738048.

The previous prime is 20215861. The next prime is 20215879. The reversal of 20215872 is 27851202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20215879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4122 + ... + 7577.

Almost surely, 2^20215872 is an apocalyptic number.

It is an amenable number.

20215872 is an abundant number, since it is smaller than the sum of its proper divisors (39220128).

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

20215872 is a wasteful number, since it uses less digits than its factorization.

20215872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11720 (or 11704 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20215872 is about 4496.2064009563. The cubic root of 20215872 is about 272.4148801280.

The spelling of 20215872 in words is "twenty million, two hundred fifteen thousand, eight hundred seventy-two".