18670720 has 32 divisors (see below), whose sum is σ = 44636220. Its totient is φ = 7468032.

The previous prime is 18670669. The next prime is 18670721. The reversal of 18670720 is 2707681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16842816 + 1827904 = 4104^2 + 1352^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (18670721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13947 + ... + 15226.

Almost surely, 2^18670720 is an apocalyptic number.

18670720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18670720 is an abundant number, since it is smaller than the sum of its proper divisors (25965500).

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

18670720 is an equidigital number, since it uses as much as digits as its factorization.

18670720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29192 (or 29180 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 18670720 is about 4320.9628556608. The cubic root of 18670720 is about 265.2896796669.

The spelling of 18670720 in words is "eighteen million, six hundred seventy thousand, seven hundred twenty".