20885310944 has 24 divisors (see below), whose sum is σ = 42535818360. Its totient is φ = 10082563456.

The previous prime is 20885310923. The next prime is 20885310949. The reversal of 20885310944 is 44901358802.

It is a happy number.

It is a super-2 number, since 2×20885310944² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20885310895 and 20885310904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20885310949) 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, 11251934 + ... + 11253789.

It is an arithmetic number, because the mean of its divisors is an integer number (1772325765).

Almost surely, 2^20885310944 is an apocalyptic number.

It is an amenable number.

20885310944 is an abundant number, since it is smaller than the sum of its proper divisors (21650507416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20885310944 is a wasteful number, since it uses less digits than its factorization.

20885310944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22505762 (or 22505754 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 20885310944 in words is "twenty billion, eight hundred eighty-five million, three hundred ten thousand, nine hundred forty-four".