20545127717 has 2 divisors, whose sum is σ = 20545127718. Its totient is φ = 20545127716.

The previous prime is 20545127651. The next prime is 20545127723. The reversal of 20545127717 is 71772154502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19869439681 + 675688036 = 140959^2 + 25994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545127717 - 2¹⁸ = 20544865573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545127417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272563858 + 10272563859.

It is an arithmetic number, because the mean of its divisors is an integer number (10272563859).

Almost surely, 2^20545127717 is an apocalyptic number.

It is an amenable number.

20545127717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545127717 is an equidigital number, since it uses as much as digits as its factorization.

20545127717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137200, while the sum is 41.

The spelling of 20545127717 in words is "twenty billion, five hundred forty-five million, one hundred twenty-seven thousand, seven hundred seventeen".