18806660 has 24 divisors (see below), whose sum is σ = 39615576. Its totient is φ = 7499520.

The previous prime is 18806633. The next prime is 18806687. The reversal of 18806660 is 6660881.

It is an interprime number because it is at equal distance from previous prime (18806633) and next prime (18806687).

It can be written as a sum of positive squares in 4 ways, for example, as 23104 + 18783556 = 152^2 + 4334^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18806660.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6200 + ... + 8720.

It is an arithmetic number, because the mean of its divisors is an integer number (1650649).

Almost surely, 2^18806660 is an apocalyptic number.

18806660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18806660 is an abundant number, since it is smaller than the sum of its proper divisors (20808916).

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

18806660 is a wasteful number, since it uses less digits than its factorization.

18806660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903 (or 2901 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18806660 is about 4336.6646169608. The cubic root of 18806660 is about 265.9319742381.

The spelling of 18806660 in words is "eighteen million, eight hundred six thousand, six hundred sixty".