20445804616 has 16 divisors (see below), whose sum is σ = 38345942700. Its totient is φ = 10220219904.

The previous prime is 20445804551. The next prime is 20445804623. The reversal of 20445804616 is 61640854402.

It can be written as a sum of positive squares in 2 ways, for example, as 18811219716 + 1634584900 = 137154^2 + 40430^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302721 + ... + 364048.

Almost surely, 2^20445804616 is an apocalyptic number.

It is an amenable number.

20445804616 is a deficient number, since it is larger than the sum of its proper divisors (17900138084).

20445804616 is a wasteful number, since it uses less digits than its factorization.

20445804616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670608 (or 670604 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 20445804616 in words is "twenty billion, four hundred forty-five million, eight hundred four thousand, six hundred sixteen".