18806720 has 28 divisors (see below), whose sum is σ = 44784264. Its totient is φ = 7522560.

The previous prime is 18806719. The next prime is 18806731. The reversal of 18806720 is 2760881.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

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, 29066 + ... + 29705.

It is an arithmetic number, because the mean of its divisors is an integer number (1599438).

Almost surely, 2^18806720 is an apocalyptic number.

18806720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18806720 is an abundant number, since it is smaller than the sum of its proper divisors (25977544).

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

18806720 is an equidigital number, since it uses as much as digits as its factorization.

18806720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58788 (or 58778 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18806720 is about 4336.6715347142. The cubic root of 18806720 is about 265.9322570439.

The spelling of 18806720 in words is "eighteen million, eight hundred six thousand, seven hundred twenty".