18208980 has 36 divisors (see below), whose sum is σ = 55234452. Its totient is φ = 4855680.

The previous prime is 18208979. The next prime is 18208999. The reversal of 18208980 is 8980281.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 5846724 = 3516^2 + 2418^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50401 + ... + 50760.

Almost surely, 2^18208980 is an apocalyptic number.

18208980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18208980 is an abundant number, since it is smaller than the sum of its proper divisors (37025472).

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

18208980 is a wasteful number, since it uses less digits than its factorization.

18208980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101176 (or 101171 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 18208980 is about 4267.1981439816. The cubic root of 18208980 is about 263.0844664046.

The spelling of 18208980 in words is "eighteen million, two hundred eight thousand, nine hundred eighty".