18116720 has 40 divisors (see below), whose sum is σ = 42299376. Its totient is φ = 7216128.

The previous prime is 18116719. The next prime is 18116723. The reversal of 18116720 is 2761181.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 18116720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18116723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34379 + ... + 34901.

Almost surely, 2^18116720 is an apocalyptic number.

18116720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18116720 is an abundant number, since it is smaller than the sum of its proper divisors (24182656).

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

18116720 is a wasteful number, since it uses less digits than its factorization.

18116720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18116720 is about 4256.3740437137. The cubic root of 18116720 is about 262.6393878010.

The spelling of 18116720 in words is "eighteen million, one hundred sixteen thousand, seven hundred twenty".