20779916711 has 4 divisors (see below), whose sum is σ = 21263170632. Its totient is φ = 20296662792.

The previous prime is 20779916669. The next prime is 20779916741. The reversal of 20779916711 is 11761997702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20779916711 - 2³⁴ = 3600047527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20779916711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779916741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241626896 + ... + 241626981.

It is an arithmetic number, because the mean of its divisors is an integer number (5315792658).

Almost surely, 2^20779916711 is an apocalyptic number.

20779916711 is a deficient number, since it is larger than the sum of its proper divisors (483253921).

20779916711 is an equidigital number, since it uses as much as digits as its factorization.

20779916711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483253920.

The product of its (nonzero) digits is 333396, while the sum is 50.

The spelling of 20779916711 in words is "twenty billion, seven hundred seventy-nine million, nine hundred sixteen thousand, seven hundred eleven".