18330920 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 7095360.

The previous prime is 18330911. The next prime is 18330941. The reversal of 18330920 is 2903381.

It is a self number, because there is not a number n which added to its sum of digits gives 18330920.

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, 6152 + ... + 8631.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^18330920 is an apocalyptic number.

18330920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18330920 is an abundant number, since it is smaller than the sum of its proper divisors (24247000).

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

18330920 is a wasteful number, since it uses less digits than its factorization.

18330920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14825 (or 14821 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 18330920 is about 4281.4623669957. The cubic root of 18330920 is about 263.6704258947.

The spelling of 18330920 in words is "eighteen million, three hundred thirty thousand, nine hundred twenty".