20173686844 has 48 divisors (see below), whose sum is σ = 36637235712. Its totient is φ = 9713071872.

The previous prime is 20173686833. The next prime is 20173686881. The reversal of 20173686844 is 44868637102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8464477 + ... + 8466859.

It is an arithmetic number, because the mean of its divisors is an integer number (763275744).

Almost surely, 2^20173686844 is an apocalyptic number.

It is an amenable number.

20173686844 is a deficient number, since it is larger than the sum of its proper divisors (16463548868).

20173686844 is a wasteful number, since it uses less digits than its factorization.

20173686844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106 (or 3104 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 20173686844 in words is "twenty billion, one hundred seventy-three million, six hundred eighty-six thousand, eight hundred forty-four".