18420564 has 24 divisors (see below), whose sum is σ = 43378720. Its totient is φ = 6083424.

The previous prime is 18420559. The next prime is 18420581. The reversal of 18420564 is 46502481.

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, 5734 + ... + 8349.

Almost surely, 2^18420564 is an apocalyptic number.

It is an amenable number.

18420564 is an abundant number, since it is smaller than the sum of its proper divisors (24958156).

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

18420564 is a wasteful number, since it uses less digits than its factorization.

18420564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14199 (or 14197 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 18420564 is about 4291.9184521610. The cubic root of 18420564 is about 264.0995377643.

The spelling of 18420564 in words is "eighteen million, four hundred twenty thousand, five hundred sixty-four".