18232320 has 88 divisors (see below), whose sum is σ = 58364064. Its totient is φ = 4857856.

The previous prime is 18232289. The next prime is 18232327. The reversal of 18232320 is 2323281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18232327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14767 + ... + 15953.

It is an arithmetic number, because the mean of its divisors is an integer number (663228).

Almost surely, 2^18232320 is an apocalyptic number.

18232320 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 18232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29182032).

18232320 is an abundant number, since it is smaller than the sum of its proper divisors (40131744).

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

18232320 is a wasteful number, since it uses less digits than its factorization.

18232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 18232320 is about 4269.9320837690. The cubic root of 18232320 is about 263.1968243320.

The spelling of 18232320 in words is "eighteen million, two hundred thirty-two thousand, three hundred twenty".