18192220 has 12 divisors (see below), whose sum is σ = 38203704. Its totient is φ = 7276880.

The previous prime is 18192217. The next prime is 18192263. The reversal of 18192220 is 2229181.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 454786 + ... + 454825.

It is an arithmetic number, because the mean of its divisors is an integer number (3183642).

Almost surely, 2^18192220 is an apocalyptic number.

18192220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18192220 is an abundant number, since it is smaller than the sum of its proper divisors (20011484).

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

18192220 is a wasteful number, since it uses less digits than its factorization.

18192220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909620 (or 909618 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18192220 is about 4265.2338740097. The cubic root of 18192220 is about 263.0037251228.

The spelling of 18192220 in words is "eighteen million, one hundred ninety-two thousand, two hundred twenty".