18086220 has 48 divisors (see below), whose sum is σ = 56269920. Its totient is φ = 4822848.

The previous prime is 18086219. The next prime is 18086221. The reversal of 18086220 is 2268081.

It is an interprime number because it is at equal distance from previous prime (18086219) and next prime (18086221).

It is a super-2 number, since 2×18086220² = 654222707776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18086221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16207 + ... + 17286.

It is an arithmetic number, because the mean of its divisors is an integer number (1172290).

Almost surely, 2^18086220 is an apocalyptic number.

18086220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18086220 is an abundant number, since it is smaller than the sum of its proper divisors (38183700).

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

18086220 is a wasteful number, since it uses less digits than its factorization.

18086220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33511 (or 33503 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18086220 is about 4252.7896726737. The cubic root of 18086220 is about 262.4919181185.

The spelling of 18086220 in words is "eighteen million, eighty-six thousand, two hundred twenty".