18166980 has 48 divisors (see below), whose sum is σ = 54782784. Its totient is φ = 4471680.

The previous prime is 18166979. The next prime is 18167011. The reversal of 18166980 is 8966181.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10866 + ... + 12425.

It is an arithmetic number, because the mean of its divisors is an integer number (1141308).

Almost surely, 2^18166980 is an apocalyptic number.

18166980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18166980 is an abundant number, since it is smaller than the sum of its proper divisors (36615804).

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

18166980 is a wasteful number, since it uses less digits than its factorization.

18166980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23316 (or 23314 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18166980 is about 4262.2740409317. The cubic root of 18166980 is about 262.8820378235.

It can be divided in two parts, 181 and 66980, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 18166980 in words is "eighteen million, one hundred sixty-six thousand, nine hundred eighty".