20307320476517 has 2 divisors, whose sum is σ = 20307320476518. Its totient is φ = 20307320476516.

The previous prime is 20307320476459. The next prime is 20307320476603. The reversal of 20307320476517 is 71567402370302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16619637804961 + 3687682671556 = 4076719^2 + 1920334^2 .

It is a cyclic number.

It is not a de Polignac number, because 20307320476517 - 2⁶ = 20307320476453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20307320416517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153660238258 + 10153660238259.

It is an arithmetic number, because the mean of its divisors is an integer number (10153660238259).

Almost surely, 2^{20307320476517} is an apocalyptic number.

It is an amenable number.

20307320476517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20307320476517 is an equidigital number, since it uses as much as digits as its factorization.

20307320476517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 47.

The spelling of 20307320476517 in words is "twenty trillion, three hundred seven billion, three hundred twenty million, four hundred seventy-six thousand, five hundred seventeen".