18366720 has 72 divisors (see below), whose sum is σ = 58670976. Its totient is φ = 4896768.

The previous prime is 18366709. The next prime is 18366721. The reversal of 18366720 is 2766381.

It is not an unprimeable number, because it can be changed into a prime (18366721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449 + ... + 6231.

Almost surely, 2^18366720 is an apocalyptic number.

18366720 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 18366720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29335488).

18366720 is an abundant number, since it is smaller than the sum of its proper divisors (40304256).

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

18366720 is an equidigital number, since it uses as much as digits as its factorization.

18366720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4807 (or 4793 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 18366720 is about 4285.6411422330. The cubic root of 18366720 is about 263.8419623462.

The spelling of 18366720 in words is "eighteen million, three hundred sixty-six thousand, seven hundred twenty".