20944583571 has 4 divisors (see below), whose sum is σ = 27926111432. Its totient is φ = 13963055712.

The previous prime is 20944583521. The next prime is 20944583581. The reversal of 20944583571 is 17538544902.

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

It is not a de Polignac number, because 20944583571 - 2¹⁸ = 20944321427 is a prime.

It is a super-2 number, since 2×20944583571² (a number of 21 digits) contains 22 as substring.

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 20944583571.

It is not an unprimeable number, because it can be changed into a prime (20944583521) 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, 3490763926 + ... + 3490763931.

It is an arithmetic number, because the mean of its divisors is an integer number (6981527858).

Almost surely, 2^20944583571 is an apocalyptic number.

20944583571 is a deficient number, since it is larger than the sum of its proper divisors (6981527861).

20944583571 is an equidigital number, since it uses as much as digits as its factorization.

20944583571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981527860.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 20944583571 in words is "twenty billion, nine hundred forty-four million, five hundred eighty-three thousand, five hundred seventy-one".