18547980 has 96 divisors (see below), whose sum is σ = 57335040. Its totient is φ = 4442880.

The previous prime is 18547979. The next prime is 18547981. The reversal of 18547980 is 8974581.

It is an interprime number because it is at equal distance from previous prime (18547979) and next prime (18547981).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18547981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103531 + ... + 103709.

It is an arithmetic number, because the mean of its divisors is an integer number (597240).

Almost surely, 2^18547980 is an apocalyptic number.

18547980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18547980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28667520).

18547980 is an abundant number, since it is smaller than the sum of its proper divisors (38787060).

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

18547980 is a wasteful number, since it uses less digits than its factorization.

18547980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18547980 is about 4306.7365835398. The cubic root of 18547980 is about 264.7070692176.

The spelling of 18547980 in words is "eighteen million, five hundred forty-seven thousand, nine hundred eighty".