20826784605317 has 2 divisors, whose sum is σ = 20826784605318. Its totient is φ = 20826784605316.

The previous prime is 20826784605181. The next prime is 20826784605349. The reversal of 20826784605317 is 71350648762802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20653307357281 + 173477248036 = 4544591^2 + 416506^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826784605317 - 2²⁰ = 20826783556741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826784605017) 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 as a sum of consecutive naturals, namely, 10413392302658 + 10413392302659.

It is an arithmetic number, because the mean of its divisors is an integer number (10413392302659).

Almost surely, 2^{20826784605317} is an apocalyptic number.

It is an amenable number.

20826784605317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826784605317 is an equidigital number, since it uses as much as digits as its factorization.

20826784605317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27095040, while the sum is 59.

The spelling of 20826784605317 in words is "twenty trillion, eight hundred twenty-six billion, seven hundred eighty-four million, six hundred five thousand, three hundred seventeen".