18900320 has 24 divisors (see below), whose sum is σ = 44652384. Its totient is φ = 7560064.

The previous prime is 18900313. The next prime is 18900331. The reversal of 18900320 is 2300981.

It is a super-2 number, since 2×18900320² = 714444192204800, which contains 22 as substring.

It is a congruent number.

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, 58904 + ... + 59223.

It is an arithmetic number, because the mean of its divisors is an integer number (1860516).

Almost surely, 2^18900320 is an apocalyptic number.

18900320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18900320 is an abundant number, since it is smaller than the sum of its proper divisors (25752064).

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

18900320 is a wasteful number, since it uses less digits than its factorization.

18900320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118142 (or 118134 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18900320 is about 4347.4498271975. The cubic root of 18900320 is about 266.3727038438.

The spelling of 18900320 in words is "eighteen million, nine hundred thousand, three hundred twenty".