18922645 has 32 divisors (see below), whose sum is σ = 27256320. Its totient is φ = 12337920.

The previous prime is 18922637. The next prime is 18922669. The reversal of 18922645 is 54622981.

It is not a de Polignac number, because 18922645 - 2³ = 18922637 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 in 31 ways as a sum of consecutive naturals, for example, 104455 + ... + 104635.

It is an arithmetic number, because the mean of its divisors is an integer number (851760).

Almost surely, 2^18922645 is an apocalyptic number.

It is an amenable number.

18922645 is a deficient number, since it is larger than the sum of its proper divisors (8333675).

18922645 is a wasteful number, since it uses less digits than its factorization.

18922645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its digits is 34560, while the sum is 37.

The square root of 18922645 is about 4350.0166666347. The cubic root of 18922645 is about 266.4775421166.

The spelling of 18922645 in words is "eighteen million, nine hundred twenty-two thousand, six hundred forty-five".