18032520 has 128 divisors (see below), whose sum is σ = 62208000. Its totient is φ = 4135680.

The previous prime is 18032513. The next prime is 18032587. The reversal of 18032520 is 2523081.

18032520 is nontrivially palindromic in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24721 + ... + 25439.

It is an arithmetic number, because the mean of its divisors is an integer number (486000).

Almost surely, 2^18032520 is an apocalyptic number.

18032520 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 18032520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31104000).

18032520 is an abundant number, since it is smaller than the sum of its proper divisors (44175480).

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

18032520 is a wasteful number, since it uses less digits than its factorization.

18032520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 18032520 is about 4246.4714764143. The cubic root of 18032520 is about 262.2318713400.

The spelling of 18032520 in words is "eighteen million, thirty-two thousand, five hundred twenty".