18320955 has 16 divisors (see below), whose sum is σ = 29428224. Its totient is φ = 9732960.

The previous prime is 18320947. The next prime is 18320963. The reversal of 18320955 is 55902381.

It is an interprime number because it is at equal distance from previous prime (18320947) and next prime (18320963).

It is not a de Polignac number, because 18320955 - 2³ = 18320947 is a prime.

It is a super-2 number, since 2×18320955² = 671314784224050, which contains 22 as substring.

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, 1812 + ... + 6318.

It is an arithmetic number, because the mean of its divisors is an integer number (1839264).

Almost surely, 2^18320955 is an apocalyptic number.

18320955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18320955 is a deficient number, since it is larger than the sum of its proper divisors (11107269).

18320955 is a wasteful number, since it uses less digits than its factorization.

18320955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 18320955 is about 4280.2984709013. The cubic root of 18320955 is about 263.6226386578.

The spelling of 18320955 in words is "eighteen million, three hundred twenty thousand, nine hundred fifty-five".