20012195905717 has 2 divisors, whose sum is σ = 20012195905718. Its totient is φ = 20012195905716.

The previous prime is 20012195905711. The next prime is 20012195905729. The reversal of 20012195905717 is 71750959121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17173614539236 + 2838581366481 = 4144106^2 + 1684809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012195905717 - 2¹¹ = 20012195903669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012195905711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006097952858 + 10006097952859.

It is an arithmetic number, because the mean of its divisors is an integer number (10006097952859).

Almost surely, 2^{20012195905717} is an apocalyptic number.

It is an amenable number.

20012195905717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012195905717 is an equidigital number, since it uses as much as digits as its factorization.

20012195905717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 49.

The spelling of 20012195905717 in words is "twenty trillion, twelve billion, one hundred ninety-five million, nine hundred five thousand, seven hundred seventeen".