20664608 has 24 divisors (see below), whose sum is σ = 40803840. Its totient is φ = 10301760.

The previous prime is 20664601. The next prime is 20664641. The reversal of 20664608 is 80646602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20664601) 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, 13313 + ... + 14783.

It is an arithmetic number, because the mean of its divisors is an integer number (1700160).

Almost surely, 2^20664608 is an apocalyptic number.

It is an amenable number.

20664608 is a deficient number, since it is larger than the sum of its proper divisors (20139232).

20664608 is a wasteful number, since it uses less digits than its factorization.

20664608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20664608 is about 4545.8341368774. The cubic root of 20664608 is about 274.4157646342.

The spelling of 20664608 in words is "twenty million, six hundred sixty-four thousand, six hundred eight".