20570560726717 has 2 divisors, whose sum is σ = 20570560726718. Its totient is φ = 20570560726716.

The previous prime is 20570560726673. The next prime is 20570560726721. The reversal of 20570560726717 is 71762706507502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16464207027321 + 4106353699396 = 4057611^2 + 2026414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20570560726717 is a prime.

It is a super-2 number, since 2×20570560726717² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20570560726517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10285280363358 + 10285280363359.

It is an arithmetic number, because the mean of its divisors is an integer number (10285280363359).

Almost surely, 2^{20570560726717} is an apocalyptic number.

It is an amenable number.

20570560726717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20570560726717 is an equidigital number, since it uses as much as digits as its factorization.

20570560726717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8643600, while the sum is 55.

The spelling of 20570560726717 in words is "twenty trillion, five hundred seventy billion, five hundred sixty million, seven hundred twenty-six thousand, seven hundred seventeen".