18320432 has 20 divisors (see below), whose sum is σ = 38226720. Its totient is φ = 8455488.

The previous prime is 18320429. The next prime is 18320461. The reversal of 18320432 is 23402381.

It is a junction number, because it is equal to n+sod(n) for n = 18320398 and 18320407.

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, 43832 + ... + 44247.

It is an arithmetic number, because the mean of its divisors is an integer number (1911336).

Almost surely, 2^18320432 is an apocalyptic number.

It is an amenable number.

18320432 is an abundant number, since it is smaller than the sum of its proper divisors (19906288).

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

18320432 is a wasteful number, since it uses less digits than its factorization.

18320432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88100 (or 88094 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 18320432 is about 4280.2373765949. The cubic root of 18320432 is about 263.6201301286.

The spelling of 18320432 in words is "eighteen million, three hundred twenty thousand, four hundred thirty-two".