18368220 has 48 divisors (see below), whose sum is σ = 55389600. Its totient is φ = 4521216.

The previous prime is 18368173. The next prime is 18368221. The reversal of 18368220 is 2286381.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10995 + ... + 12554.

It is an arithmetic number, because the mean of its divisors is an integer number (1153950).

Almost surely, 2^18368220 is an apocalyptic number.

18368220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18368220 is an abundant number, since it is smaller than the sum of its proper divisors (37021380).

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

18368220 is a wasteful number, since it uses less digits than its factorization.

18368220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23574 (or 23572 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18368220 is about 4285.8161416468. The cubic root of 18368220 is about 263.8491447603.

The spelling of 18368220 in words is "eighteen million, three hundred sixty-eight thousand, two hundred twenty".