18984920 has 32 divisors (see below), whose sum is σ = 45230400. Its totient is φ = 7147008.

The previous prime is 18984907. The next prime is 18984941. The reversal of 18984920 is 2948981.

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, 13280 + ... + 14639.

It is an arithmetic number, because the mean of its divisors is an integer number (1413450).

Almost surely, 2^18984920 is an apocalyptic number.

18984920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18984920 is an abundant number, since it is smaller than the sum of its proper divisors (26245480).

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

18984920 is a wasteful number, since it uses less digits than its factorization.

18984920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27947 (or 27943 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18984920 is about 4357.1688055433. The cubic root of 18984920 is about 266.7695505786.

The spelling of 18984920 in words is "eighteen million, nine hundred eighty-four thousand, nine hundred twenty".