18955660 has 12 divisors (see below), whose sum is σ = 39806928. Its totient is φ = 7582256.

The previous prime is 18955627. The next prime is 18955661. The reversal of 18955660 is 6655981.

It is not an unprimeable number, because it can be changed into a prime (18955661) 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 3 ways as a sum of consecutive naturals, for example, 473872 + ... + 473911.

It is an arithmetic number, because the mean of its divisors is an integer number (3317244).

Almost surely, 2^18955660 is an apocalyptic number.

18955660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18955660 is an abundant number, since it is smaller than the sum of its proper divisors (20851268).

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

18955660 is a wasteful number, since it uses less digits than its factorization.

18955660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947792 (or 947790 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 18955660 is about 4353.8098258881. The cubic root of 18955660 is about 266.6324296323.

The spelling of 18955660 in words is "eighteen million, nine hundred fifty-five thousand, six hundred sixty".