18213680 has 20 divisors (see below), whose sum is σ = 42346992. Its totient is φ = 7285440.

The previous prime is 18213667. The next prime is 18213703. The reversal of 18213680 is 8631281.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113756 + ... + 113915.

Almost surely, 2^18213680 is an apocalyptic number.

18213680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18213680 is an abundant number, since it is smaller than the sum of its proper divisors (24133312).

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

18213680 is a wasteful number, since it uses less digits than its factorization.

18213680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227684 (or 227678 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18213680 is about 4267.7488210999. The cubic root of 18213680 is about 263.1070997540.

The spelling of 18213680 in words is "eighteen million, two hundred thirteen thousand, six hundred eighty".