18320626 has 4 divisors (see below), whose sum is σ = 27480942. Its totient is φ = 9160312.

The previous prime is 18320609. The next prime is 18320629. The reversal of 18320626 is 62602381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 6245001 = 3475^2 + 2499^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18320594 and 18320603.

It is not an unprimeable number, because it can be changed into a prime (18320629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4580155 + ... + 4580158.

Almost surely, 2^18320626 is an apocalyptic number.

18320626 is a deficient number, since it is larger than the sum of its proper divisors (9160316).

18320626 is an equidigital number, since it uses as much as digits as its factorization.

18320626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160315.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18320626 is about 4280.2600388294. The cubic root of 18320626 is about 263.6210606402.

The spelling of 18320626 in words is "eighteen million, three hundred twenty thousand, six hundred twenty-six".