20644325330 has 16 divisors (see below), whose sum is σ = 38066122584. Its totient is φ = 8056321920.

The previous prime is 20644325293. The next prime is 20644325419. The reversal of 20644325330 is 3352344602.

It can be written as a sum of positive squares in 4 ways, for example, as 4357716169 + 16286609161 = 66013^2 + 127619^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25175597 + ... + 25176416.

Almost surely, 2^20644325330 is an apocalyptic number.

20644325330 is a deficient number, since it is larger than the sum of its proper divisors (17421797254).

20644325330 is a wasteful number, since it uses less digits than its factorization.

20644325330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50352061.

The product of its (nonzero) digits is 51840, while the sum is 32.

Adding to 20644325330 its reverse (3352344602), we get a palindrome (23996669932).

The spelling of 20644325330 in words is "twenty billion, six hundred forty-four million, three hundred twenty-five thousand, three hundred thirty".