18923664 has 80 divisors (see below), whose sum is σ = 52032384. Its totient is φ = 5913600.

The previous prime is 18923651. The next prime is 18923743. The reversal of 18923664 is 46632981.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67204 + ... + 67484.

Almost surely, 2^18923664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18923664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26016192).

18923664 is an abundant number, since it is smaller than the sum of its proper divisors (33108720).

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

18923664 is a wasteful number, since it uses less digits than its factorization.

18923664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 370 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 18923664 is about 4350.1337910460. The cubic root of 18923664 is about 266.4823253757.

The spelling of 18923664 in words is "eighteen million, nine hundred twenty-three thousand, six hundred sixty-four".