20423044564 has 24 divisors (see below), whose sum is σ = 39816813960. Its totient is φ = 9100984704.

The previous prime is 20423044541. The next prime is 20423044589. The reversal of 20423044564 is 46544032402.

It can be written as a sum of positive squares in 4 ways, for example, as 2961536400 + 17461508164 = 54420^2 + 132142^2 .

It is a congruent number.

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, 6770059 + ... + 6773074.

It is an arithmetic number, because the mean of its divisors is an integer number (1659033915).

Almost surely, 2^20423044564 is an apocalyptic number.

It is an amenable number.

20423044564 is a deficient number, since it is larger than the sum of its proper divisors (19393769396).

20423044564 is a wasteful number, since it uses less digits than its factorization.

20423044564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13543179 (or 13543177 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 20423044564 its reverse (46544032402), we get a palindrome (66967076966).

The spelling of 20423044564 in words is "twenty billion, four hundred twenty-three million, forty-four thousand, five hundred sixty-four".