20811990472 has 64 divisors (see below), whose sum is σ = 48045715200. Its totient is φ = 8230222080.

The previous prime is 20811990469. The next prime is 20811990481. The reversal of 20811990472 is 27409911802.

It is a happy 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, 3543154 + ... + 3549022.

It is an arithmetic number, because the mean of its divisors is an integer number (750714300).

Almost surely, 2^20811990472 is an apocalyptic number.

It is an amenable number.

20811990472 is an abundant number, since it is smaller than the sum of its proper divisors (27233724728).

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

20811990472 is a wasteful number, since it uses less digits than its factorization.

20811990472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766 (or 10762 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 20811990472 in words is "twenty billion, eight hundred eleven million, nine hundred ninety thousand, four hundred seventy-two".