18535980 has 24 divisors (see below), whose sum is σ = 51900912. Its totient is φ = 4942912.

The previous prime is 18535969. The next prime is 18535991. The reversal of 18535980 is 8953581.

It is an interprime number because it is at equal distance from previous prime (18535969) and next prime (18535991).

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, 154407 + ... + 154526.

It is an arithmetic number, because the mean of its divisors is an integer number (2162538).

Almost surely, 2^18535980 is an apocalyptic number.

18535980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18535980 is an abundant number, since it is smaller than the sum of its proper divisors (33364932).

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

18535980 is a wasteful number, since it uses less digits than its factorization.

18535980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308945 (or 308943 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 18535980 is about 4305.3431918954. The cubic root of 18535980 is about 264.6499709944.

The spelling of 18535980 in words is "eighteen million, five hundred thirty-five thousand, nine hundred eighty".