18220860 has 72 divisors (see below), whose sum is σ = 63170016. Its totient is φ = 4164480.

The previous prime is 18220849. The next prime is 18220861. The reversal of 18220860 is 6802281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220861) 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 23 ways as a sum of consecutive naturals, for example, 5971 + ... + 8490.

Almost surely, 2^18220860 is an apocalyptic number.

18220860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18220860 is an abundant number, since it is smaller than the sum of its proper divisors (44949156).

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

18220860 is a wasteful number, since it uses less digits than its factorization.

18220860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14483 (or 14478 counting only the distinct ones).

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

The square root of 18220860 is about 4268.5899311131. The cubic root of 18220860 is about 263.1416682907.

The spelling of 18220860 in words is "eighteen million, two hundred twenty thousand, eight hundred sixty".