18540320 has 24 divisors (see below), whose sum is σ = 43801884. Its totient is φ = 7416064.

The previous prime is 18540317. The next prime is 18540329. The reversal of 18540320 is 2304581.

It can be written as a sum of positive squares in 2 ways, for example, as 16613776 + 1926544 = 4076^2 + 1388^2 .

It is not an unprimeable number, because it can be changed into a prime (18540329) 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 in 3 ways as a sum of consecutive naturals, for example, 57779 + ... + 58098.

Almost surely, 2^18540320 is an apocalyptic number.

18540320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18540320 is an abundant number, since it is smaller than the sum of its proper divisors (25261564).

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

18540320 is a wasteful number, since it uses less digits than its factorization.

18540320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115892 (or 115884 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 18540320 is about 4305.8471872560. The cubic root of 18540320 is about 264.6706243623.

The spelling of 18540320 in words is "eighteen million, five hundred forty thousand, three hundred twenty".