20664312 has 16 divisors (see below), whose sum is σ = 51660840. Its totient is φ = 6888096.

The previous prime is 20664289. The next prime is 20664313. The reversal of 20664312 is 21346602.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 861013 = 20664312 / (2 + 0 + 6 + 6 + 4 + 3 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430483 + ... + 430530.

Almost surely, 2^20664312 is an apocalyptic number.

It is an amenable number.

20664312 is an abundant number, since it is smaller than the sum of its proper divisors (30996528).

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

20664312 is a wasteful number, since it uses less digits than its factorization.

20664312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861022 (or 861018 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20664312 is about 4545.8015794797. The cubic root of 20664312 is about 274.4144543834.

The spelling of 20664312 in words is "twenty million, six hundred sixty-four thousand, three hundred twelve".