20556372 has 24 divisors (see below), whose sum is σ = 48049792. Its totient is φ = 6840000.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556372 is 27365502.

It is a congruent number.

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, 7872 + ... + 10152.

Almost surely, 2^20556372 is an apocalyptic number.

It is an amenable number.

20556372 is an abundant number, since it is smaller than the sum of its proper divisors (27493420).

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

20556372 is a wasteful number, since it uses less digits than its factorization.

20556372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039 (or 3037 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 20556372 is about 4533.9135413018. The cubic root of 20556372 is about 273.9358188781.

The spelling of 20556372 in words is "twenty million, five hundred fifty-six thousand, three hundred seventy-two".