20664282664 has 8 divisors (see below), whose sum is σ = 38745530010. Its totient is φ = 10332141328.

The previous prime is 20664282647. The next prime is 20664282673. The reversal of 20664282664 is 46628246602.

It can be written as a sum of positive squares in only one way, i.e., 15139333764 + 5524948900 = 123042^2 + 74330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291517659 + ... + 1291517674.

Almost surely, 2^20664282664 is an apocalyptic number.

It is an amenable number.

20664282664 is a deficient number, since it is larger than the sum of its proper divisors (18081247346).

20664282664 is a wasteful number, since it uses less digits than its factorization.

20664282664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583035339 (or 2583035335 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 46.

The spelling of 20664282664 in words is "twenty billion, six hundred sixty-four million, two hundred eighty-two thousand, six hundred sixty-four".