18102220 has 12 divisors (see below), whose sum is σ = 38014704. Its totient is φ = 7240880.

The previous prime is 18102211. The next prime is 18102239. The reversal of 18102220 is 2220181.

It is a junction number, because it is equal to n+sod(n) for n = 18102194 and 18102203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452536 + ... + 452575.

It is an arithmetic number, because the mean of its divisors is an integer number (3167892).

Almost surely, 2^18102220 is an apocalyptic number.

18102220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18102220 is an abundant number, since it is smaller than the sum of its proper divisors (19912484).

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

18102220 is a wasteful number, since it uses less digits than its factorization.

18102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905120 (or 905118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 18102220 is about 4254.6703750114. The cubic root of 18102220 is about 262.5692999194.

The spelling of 18102220 in words is "eighteen million, one hundred two thousand, two hundred twenty".