20209911792 has 80 divisors (see below), whose sum is σ = 62807765760. Its totient is φ = 5470350336.

The previous prime is 20209911749. The next prime is 20209911803. The reversal of 20209911792 is 29711990202.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 1576473 + ... + 1589240.

It is an arithmetic number, because the mean of its divisors is an integer number (785097072).

Almost surely, 2^20209911792 is an apocalyptic number.

It is an amenable number.

20209911792 is an abundant number, since it is smaller than the sum of its proper divisors (42597853968).

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

20209911792 is a wasteful number, since it uses less digits than its factorization.

20209911792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165750 (or 3165744 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 20209911792 in words is "twenty billion, two hundred nine million, nine hundred eleven thousand, seven hundred ninety-two".