20664804 has 12 divisors (see below), whose sum is σ = 48217904. Its totient is φ = 6888264.

The previous prime is 20664793. The next prime is 20664823. The reversal of 20664804 is 40846602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 861022 + ... + 861045.

Almost surely, 2^20664804 is an apocalyptic number.

It is an amenable number.

20664804 is an abundant number, since it is smaller than the sum of its proper divisors (27553100).

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

20664804 is a wasteful number, since it uses less digits than its factorization.

20664804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722074 (or 1722072 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 20664804 is about 4545.8556950260. The cubic root of 20664804 is about 274.4166322257.

The spelling of 20664804 in words is "twenty million, six hundred sixty-four thousand, eight hundred four".