18364520 has 16 divisors (see below), whose sum is σ = 41320260. Its totient is φ = 7345792.

The previous prime is 18364519. The next prime is 18364547. The reversal of 18364520 is 2546381.

It can be written as a sum of positive squares in 2 ways, for example, as 16957924 + 1406596 = 4118^2 + 1186^2 .

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, 229517 + ... + 229596.

Almost surely, 2^18364520 is an apocalyptic number.

18364520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18364520 is an abundant number, since it is smaller than the sum of its proper divisors (22955740).

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

18364520 is a wasteful number, since it uses less digits than its factorization.

18364520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459124 (or 459120 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 18364520 is about 4285.3844634992. The cubic root of 18364520 is about 263.8314274313.

The spelling of 18364520 in words is "eighteen million, three hundred sixty-four thousand, five hundred twenty".