18320546 has 4 divisors (see below), whose sum is σ = 27480822. Its totient is φ = 9160272.

The previous prime is 18320539. The next prime is 18320551. The reversal of 18320546 is 64502381.

18320546 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64502381 = 97 ⋅664973.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 130321 = 4265^2 + 361^2 .

It is an unprimeable number.

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, 4580135 + ... + 4580138.

Almost surely, 2^18320546 is an apocalyptic number.

18320546 is a deficient number, since it is larger than the sum of its proper divisors (9160276).

18320546 is an equidigital number, since it uses as much as digits as its factorization.

18320546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160275.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 18320546 is about 4280.2506935926. The cubic root of 18320546 is about 263.6206769249.

The spelling of 18320546 in words is "eighteen million, three hundred twenty thousand, five hundred forty-six".