20717579194 has 24 divisors (see below), whose sum is σ = 33668533980. Its totient is φ = 9556904448.

The previous prime is 20717579177. The next prime is 20717579257. The reversal of 20717579194 is 49197571702.

It is a happy number.

20717579194 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 8343909025 + 12373670169 = 91345^2 + 111237^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666552 + ... + 696940.

Almost surely, 2^20717579194 is an apocalyptic number.

20717579194 is a deficient number, since it is larger than the sum of its proper divisors (12950954786).

20717579194 is a wasteful number, since it uses less digits than its factorization.

20717579194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32434 (or 32421 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 52.

The spelling of 20717579194 in words is "twenty billion, seven hundred seventeen million, five hundred seventy-nine thousand, one hundred ninety-four".