20512602317 has 2 divisors, whose sum is σ = 20512602318. Its totient is φ = 20512602316.

The previous prime is 20512602301. The next prime is 20512602361. The reversal of 20512602317 is 71320621502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10342686601 + 10169915716 = 101699^2 + 100846^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512602317 - 2⁴ = 20512602301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512602317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512602377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256301158 + 10256301159.

It is an arithmetic number, because the mean of its divisors is an integer number (10256301159).

Almost surely, 2^20512602317 is an apocalyptic number.

It is an amenable number.

20512602317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512602317 is an equidigital number, since it uses as much as digits as its factorization.

20512602317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The spelling of 20512602317 in words is "twenty billion, five hundred twelve million, six hundred two thousand, three hundred seventeen".