20317345767791 has 4 divisors (see below), whose sum is σ = 20370393668352. Its totient is φ = 20264297867232.

The previous prime is 20317345767773. The next prime is 20317345767821. The reversal of 20317345767791 is 19776754371302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20317345767791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317345767721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26523949706 + ... + 26523950471.

It is an arithmetic number, because the mean of its divisors is an integer number (5092598417088).

Almost surely, 2^{20317345767791} is an apocalyptic number.

20317345767791 is a deficient number, since it is larger than the sum of its proper divisors (53047900561).

20317345767791 is an equidigital number, since it uses as much as digits as its factorization.

20317345767791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53047900560.

The product of its (nonzero) digits is 46675440, while the sum is 62.

The spelling of 20317345767791 in words is "twenty trillion, three hundred seventeen billion, three hundred forty-five million, seven hundred sixty-seven thousand, seven hundred ninety-one".