20664970 has 32 divisors (see below), whose sum is σ = 39818880. Its totient is φ = 7698240.

The previous prime is 20664967. The next prime is 20665009. The reversal of 20664970 is 7946602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10699 + ... + 12481.

It is an arithmetic number, because the mean of its divisors is an integer number (1244340).

Almost surely, 2^20664970 is an apocalyptic number.

20664970 is a deficient number, since it is larger than the sum of its proper divisors (19153910).

20664970 is a wasteful number, since it uses less digits than its factorization.

20664970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20664970 is about 4545.8739533779. The cubic root of 20664970 is about 274.4173670184.

The spelling of 20664970 in words is "twenty million, six hundred sixty-four thousand, nine hundred seventy".