18044920 has 32 divisors (see below), whose sum is σ = 41595120. Its totient is φ = 7041280.

The previous prime is 18044899. The next prime is 18044933. The reversal of 18044920 is 2944081.

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, 3862 + ... + 7141.

Almost surely, 2^18044920 is an apocalyptic number.

18044920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18044920 is an abundant number, since it is smaller than the sum of its proper divisors (23550200).

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

18044920 is a wasteful number, since it uses less digits than its factorization.

18044920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11055 (or 11051 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18044920 is about 4247.9312612141. The cubic root of 18044920 is about 262.2919651807.

It can be divided in two parts, 1804 and 4920, that added together give a square (6724 = 82²).

The spelling of 18044920 in words is "eighteen million, forty-four thousand, nine hundred twenty".