19664812 has 6 divisors (see below), whose sum is σ = 34413428. Its totient is φ = 9832404.

The previous prime is 19664779. The next prime is 19664833. The reversal of 19664812 is 21846691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2458098 + ... + 2458105.

Almost surely, 2^19664812 is an apocalyptic number.

It is an amenable number.

19664812 is a deficient number, since it is larger than the sum of its proper divisors (14748616).

19664812 is a wasteful number, since it uses less digits than its factorization.

19664812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916207 (or 4916205 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 19664812 is about 4434.5024523615. The cubic root of 19664812 is about 269.9168102192.

The spelling of 19664812 in words is "nineteen million, six hundred sixty-four thousand, eight hundred twelve".