18999680 has 64 divisors (see below), whose sum is σ = 51922080. Its totient is φ = 6512640.

The previous prime is 18999667. The next prime is 18999691. The reversal of 18999680 is 8699981.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360 + ... + 6600.

Almost surely, 2^18999680 is an apocalyptic number.

18999680 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 18999680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25961040).

18999680 is an abundant number, since it is smaller than the sum of its proper divisors (32922400).

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

18999680 is an equidigital number, since it uses as much as digits as its factorization.

18999680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267 (or 4255 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 18999680 is about 4358.8622368687. The cubic root of 18999680 is about 266.8386668137.

The spelling of 18999680 in words is "eighteen million, nine hundred ninety-nine thousand, six hundred eighty".