20664908 has 12 divisors (see below), whose sum is σ = 39451272. Its totient is φ = 9393120.

The previous prime is 20664893. The next prime is 20664923. The reversal of 20664908 is 80946602.

It is an interprime number because it is at equal distance from previous prime (20664893) and next prime (20664923).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234785 + ... + 234872.

It is an arithmetic number, because the mean of its divisors is an integer number (3287606).

Almost surely, 2^20664908 is an apocalyptic number.

It is an amenable number.

20664908 is a deficient number, since it is larger than the sum of its proper divisors (18786364).

20664908 is a wasteful number, since it uses less digits than its factorization.

20664908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469672 (or 469670 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20664908 is about 4545.8671340020. The cubic root of 20664908 is about 274.4170925782.

The spelling of 20664908 in words is "twenty million, six hundred sixty-four thousand, nine hundred eight".