18320055 has 16 divisors (see below), whose sum is σ = 31567200. Its totient is φ = 9019008.

The previous prime is 18320041. The next prime is 18320063. The reversal of 18320055 is 55002381.

It is not a de Polignac number, because 18320055 - 2⁶ = 18319991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46780 + ... + 47169.

It is an arithmetic number, because the mean of its divisors is an integer number (1972950).

Almost surely, 2^18320055 is an apocalyptic number.

18320055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18320055 is a deficient number, since it is larger than the sum of its proper divisors (13247145).

18320055 is a wasteful number, since it uses less digits than its factorization.

18320055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93970.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 18320055 is about 4280.1933367548. The cubic root of 18320055 is about 263.6183218475.

The spelling of 18320055 in words is "eighteen million, three hundred twenty thousand, fifty-five".