18320944 has 10 divisors (see below), whose sum is σ = 35496860. Its totient is φ = 9160464.

The previous prime is 18320933. The next prime is 18320947. The reversal of 18320944 is 44902381.

It is a super-2 number, since 2×18320944² = 671313978102272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18320947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572514 + ... + 572545.

It is an arithmetic number, because the mean of its divisors is an integer number (3549686).

Almost surely, 2^18320944 is an apocalyptic number.

It is an amenable number.

18320944 is a deficient number, since it is larger than the sum of its proper divisors (17175916).

18320944 is a wasteful number, since it uses less digits than its factorization.

18320944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145067 (or 1145061 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18320944 is about 4280.2971859440. The cubic root of 18320944 is about 263.6225858976.

The spelling of 18320944 in words is "eighteen million, three hundred twenty thousand, nine hundred forty-four".