18099320 has 32 divisors (see below), whose sum is σ = 41303520. Its totient is φ = 7136640.

The previous prime is 18099317. The next prime is 18099331. The reversal of 18099320 is 2399081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347 + ... + 6026.

It is an arithmetic number, because the mean of its divisors is an integer number (1290735).

Almost surely, 2^18099320 is an apocalyptic number.

18099320 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 18099320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20651760).

18099320 is an abundant number, since it is smaller than the sum of its proper divisors (23204200).

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

18099320 is a wasteful number, since it uses less digits than its factorization.

18099320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455 (or 6451 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 18099320 is about 4254.3295594018. The cubic root of 18099320 is about 262.5552778522. Note that the first 3 decimals are identical.

The spelling of 18099320 in words is "eighteen million, ninety-nine thousand, three hundred twenty".