18086320 has 40 divisors (see below), whose sum is σ = 48059424. Its totient is φ = 6200832.

The previous prime is 18086279. The next prime is 18086357. The reversal of 18086320 is 2368081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×18086320² = 654229942284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 15589 + ... + 16708.

Almost surely, 2^18086320 is an apocalyptic number.

18086320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18086320 is an abundant number, since it is smaller than the sum of its proper divisors (29973104).

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

18086320 is a wasteful number, since it uses less digits than its factorization.

18086320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32317 (or 32311 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18086320 is about 4252.8014296461. The cubic root of 18086320 is about 262.4924018965.

It can be divided in two parts, 1808 and 6320, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 18086320 in words is "eighteen million, eighty-six thousand, three hundred twenty".