20940712059517 has 2 divisors, whose sum is σ = 20940712059518. Its totient is φ = 20940712059516.

The previous prime is 20940712059511. The next prime is 20940712059539. The reversal of 20940712059517 is 71595021704902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386781667481 + 4553930392036 = 4048059^2 + 2133994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20940712059517 - 2¹⁵ = 20940712026749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20940712059511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470356029758 + 10470356029759.

It is an arithmetic number, because the mean of its divisors is an integer number (10470356029759).

Almost surely, 2^{20940712059517} is an apocalyptic number.

It is an amenable number.

20940712059517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20940712059517 is an equidigital number, since it uses as much as digits as its factorization.

20940712059517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 20940712059517 in words is "twenty trillion, nine hundred forty billion, seven hundred twelve million, fifty-nine thousand, five hundred seventeen".