20644444602 has 12 divisors (see below), whose sum is σ = 44729630010. Its totient is φ = 6881481528.

The previous prime is 20644444591. The next prime is 20644444633.

20644444602 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 4 + 4 + 44 + 602 = 666.

20644444602 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 15768076041 + 4876368561 = 125571^2 + 69831^2 .

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 5 ways as a sum of consecutive naturals, for example, 573456777 + ... + 573456812.

Almost surely, 2^20644444602 is an apocalyptic number.

20644444602 is an abundant number, since it is smaller than the sum of its proper divisors (24085185408).

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

20644444602 is a wasteful number, since it uses less digits than its factorization.

20644444602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146913597 (or 1146913594 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

The spelling of 20644444602 in words is "twenty billion, six hundred forty-four million, four hundred forty-four thousand, six hundred two".