20664633610 has 8 divisors (see below), whose sum is σ = 37196340516. Its totient is φ = 8265853440.

The previous prime is 20664633599. The next prime is 20664633623. The reversal of 20664633610 is 1633646602.

It can be written as a sum of positive squares in 2 ways, for example, as 20041781761 + 622851849 = 141569^2 + 24957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20664633610.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033231671 + ... + 1033231690.

Almost surely, 2^20664633610 is an apocalyptic number.

20664633610 is a deficient number, since it is larger than the sum of its proper divisors (16531706906).

20664633610 is a wasteful number, since it uses less digits than its factorization.

20664633610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066463368.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 20664633610 in words is "twenty billion, six hundred sixty-four million, six hundred thirty-three thousand, six hundred ten".