20779886867169 has 24 divisors (see below), whose sum is σ = 28632207312576. Its totient is φ = 13404926032800.

The previous prime is 20779886867111. The next prime is 20779886867183. The reversal of 20779886867169 is 96176868897702.

It is not a de Polignac number, because 20779886867169 - 2⁷ = 20779886867041 is a prime.

It is a super-2 number, since 2×20779886867169² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20779886867091 and 20779886867100.

It is not an unprimeable number, because it can be changed into a prime (20779886867189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26544292 + ... + 27315914.

It is an arithmetic number, because the mean of its divisors is an integer number (1193008638024).

Almost surely, 2^{20779886867169} is an apocalyptic number.

It is an amenable number.

20779886867169 is a deficient number, since it is larger than the sum of its proper divisors (7852320445407).

20779886867169 is an equidigital number, since it uses as much as digits as its factorization.

20779886867169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781029 (or 780998 counting only the distinct ones).

The product of its (nonzero) digits is 6145155072, while the sum is 84.

The spelling of 20779886867169 in words is "twenty trillion, seven hundred seventy-nine billion, eight hundred eighty-six million, eight hundred sixty-seven thousand, one hundred sixty-nine".