20644708608 has 108 divisors (see below), whose sum is σ = 63025303068. Its totient is φ = 6476759040.

The previous prime is 20644708603. The next prime is 20644708619. The reversal of 20644708608 is 80680744602.

It can be written as a sum of positive squares in 2 ways, for example, as 8887209984 + 11757498624 = 94272^2 + 108432^2 .

It is not an unprimeable number, because it can be changed into a prime (20644708603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224373 + ... + 302708.

It is an arithmetic number, because the mean of its divisors is an integer number (583567621).

Almost surely, 2^20644708608 is an apocalyptic number.

It is an amenable number.

20644708608 is an abundant number, since it is smaller than the sum of its proper divisors (42380594460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20644708608 is a wasteful number, since it uses less digits than its factorization.

20644708608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527120 (or 527103 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 20644708608 in words is "twenty billion, six hundred forty-four million, seven hundred eight thousand, six hundred eight".