18506980 has 12 divisors (see below), whose sum is σ = 38864700. Its totient is φ = 7402784.

The previous prime is 18506977. The next prime is 18506981. The reversal of 18506980 is 8960581.

It can be written as a sum of positive squares in 2 ways, for example, as 11505664 + 7001316 = 3392^2 + 2646^2 .

It is not an unprimeable number, because it can be changed into a prime (18506981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462655 + ... + 462694.

It is an arithmetic number, because the mean of its divisors is an integer number (3238725).

Almost surely, 2^18506980 is an apocalyptic number.

18506980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18506980 is an abundant number, since it is smaller than the sum of its proper divisors (20357720).

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

18506980 is a wasteful number, since it uses less digits than its factorization.

18506980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925358 (or 925356 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 18506980 is about 4301.9739655186. The cubic root of 18506980 is about 264.5118818090.

The spelling of 18506980 in words is "eighteen million, five hundred six thousand, nine hundred eighty".