20983847173 has 4 divisors (see below), whose sum is σ = 21707428140. Its totient is φ = 20260266208.

The previous prime is 20983847149. The next prime is 20983847179. The reversal of 20983847173 is 37174838902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12894283809 + 8089563364 = 113553^2 + 89942^2 .

It is a cyclic number.

It is not a de Polignac number, because 20983847173 - 2⁹ = 20983846661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20983847173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983847179) 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, 361790440 + ... + 361790497.

It is an arithmetic number, because the mean of its divisors is an integer number (5426857035).

Almost surely, 2^20983847173 is an apocalyptic number.

It is an amenable number.

20983847173 is a deficient number, since it is larger than the sum of its proper divisors (723580967).

20983847173 is an equidigital number, since it uses as much as digits as its factorization.

20983847173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723580966.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 20983847173 in words is "twenty billion, nine hundred eighty-three million, eight hundred forty-seven thousand, one hundred seventy-three".