20779432718794 has 8 divisors (see below), whose sum is σ = 31367678690628. Its totient is φ = 10323539821920.

The previous prime is 20779432718743. The next prime is 20779432718813. The reversal of 20779432718794 is 49781723497702.

It can be written as a sum of positive squares in 2 ways, for example, as 17323384406769 + 3456048312025 = 4162137^2 + 1859045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20779432718794² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33088268347 + ... + 33088268974.

Almost surely, 2^{20779432718794} is an apocalyptic number.

20779432718794 is a deficient number, since it is larger than the sum of its proper divisors (10588245971834).

20779432718794 is a wasteful number, since it uses less digits than its factorization.

20779432718794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66176537480.

The product of its (nonzero) digits is 298722816, while the sum is 70.

The spelling of 20779432718794 in words is "twenty trillion, seven hundred seventy-nine billion, four hundred thirty-two million, seven hundred eighteen thousand, seven hundred ninety-four".