20579642644 has 12 divisors (see below), whose sum is σ = 39288408768. Its totient is φ = 9354383000.

The previous prime is 20579642617. The next prime is 20579642647. The reversal of 20579642644 is 44624697502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579642647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233859532 + ... + 233859619.

It is an arithmetic number, because the mean of its divisors is an integer number (3274034064).

Almost surely, 2^20579642644 is an apocalyptic number.

It is an amenable number.

20579642644 is a deficient number, since it is larger than the sum of its proper divisors (18708766124).

20579642644 is a wasteful number, since it uses less digits than its factorization.

20579642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467719166 (or 467719164 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 20579642644 in words is "twenty billion, five hundred seventy-nine million, six hundred forty-two thousand, six hundred forty-four".