20180904 has 32 divisors (see below), whose sum is σ = 53421120. Its totient is φ = 6331136.

The previous prime is 20180879. The next prime is 20180933. The reversal of 20180904 is 40908102.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 24324 + ... + 25139.

It is an arithmetic number, because the mean of its divisors is an integer number (1669410).

Almost surely, 2^20180904 is an apocalyptic number.

20180904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20180904 is an abundant number, since it is smaller than the sum of its proper divisors (33240216).

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

20180904 is a wasteful number, since it uses less digits than its factorization.

20180904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49489 (or 49485 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20180904 is about 4492.3161064199. The cubic root of 20180904 is about 272.2577214168.

The spelling of 20180904 in words is "twenty million, one hundred eighty thousand, nine hundred four".