18133320 has 64 divisors (see below), whose sum is σ = 54846720. Its totient is φ = 4795904.

The previous prime is 18133309. The next prime is 18133321. The reversal of 18133320 is 2333181.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18133321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15889 + ... + 16991.

It is an arithmetic number, because the mean of its divisors is an integer number (856980).

Almost surely, 2^18133320 is an apocalyptic number.

18133320 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 18133320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27423360).

18133320 is an abundant number, since it is smaller than the sum of its proper divisors (36713400).

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

18133320 is a wasteful number, since it uses less digits than its factorization.

18133320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 18133320 is about 4258.3236138180. The cubic root of 18133320 is about 262.7195804428.

The spelling of 18133320 in words is "eighteen million, one hundred thirty-three thousand, three hundred twenty".