18520660 has 12 divisors (see below), whose sum is σ = 38893428. Its totient is φ = 7408256.

The previous prime is 18520613. The next prime is 18520693. The reversal of 18520660 is 6602581.

It can be written as a sum of positive squares in 2 ways, for example, as 7150276 + 11370384 = 2674^2 + 3372^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 462997 + ... + 463036.

It is an arithmetic number, because the mean of its divisors is an integer number (3241119).

Almost surely, 2^18520660 is an apocalyptic number.

18520660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18520660 is an abundant number, since it is smaller than the sum of its proper divisors (20372768).

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

18520660 is a wasteful number, since it uses less digits than its factorization.

18520660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926042 (or 926040 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18520660 is about 4303.5636395899. The cubic root of 18520660 is about 264.5770397715.

The spelling of 18520660 in words is "eighteen million, five hundred twenty thousand, six hundred sixty".