20664304 has 40 divisors (see below), whose sum is σ = 42131232. Its totient is φ = 9799680.

The previous prime is 20664289. The next prime is 20664313. The reversal of 20664304 is 40346602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85624 + ... + 85864.

Almost surely, 2^20664304 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 20664304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21065616).

20664304 is an abundant number, since it is smaller than the sum of its proper divisors (21466928).

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

20664304 is a wasteful number, since it uses less digits than its factorization.

20664304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20664304 is about 4545.8006995468. The cubic root of 20664304 is about 274.4144189711.

The spelling of 20664304 in words is "twenty million, six hundred sixty-four thousand, three hundred four".