18617980 has 24 divisors (see below), whose sum is σ = 40360320. Its totient is φ = 7206720.

The previous prime is 18617959. The next prime is 18617983. The reversal of 18617980 is 8971681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18617983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14395 + ... + 15634.

It is an arithmetic number, because the mean of its divisors is an integer number (1681680).

Almost surely, 2^18617980 is an apocalyptic number.

18617980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18617980 is an abundant number, since it is smaller than the sum of its proper divisors (21742340).

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

18617980 is a wasteful number, since it uses less digits than its factorization.

18617980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30069 (or 30067 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18617980 is about 4314.8557333936. The cubic root of 18617980 is about 265.0396523078.

The spelling of 18617980 in words is "eighteen million, six hundred seventeen thousand, nine hundred eighty".