18012920 has 32 divisors (see below), whose sum is σ = 40666320. Its totient is φ = 7180800.

The previous prime is 18012919. The next prime is 18012947. The reversal of 18012920 is 2921081.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15479 + ... + 16601.

Almost surely, 2^18012920 is an apocalyptic number.

18012920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18012920 is an abundant number, since it is smaller than the sum of its proper divisors (22653400).

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

18012920 is a wasteful number, since it uses less digits than its factorization.

18012920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18012920 is about 4244.1630505908. The cubic root of 18012920 is about 262.1368280889.

The spelling of 18012920 in words is "eighteen million, twelve thousand, nine hundred twenty".