20312789317 has 2 divisors, whose sum is σ = 20312789318. Its totient is φ = 20312789316.

The previous prime is 20312789293. The next prime is 20312789327. The reversal of 20312789317 is 71398721302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18641533156 + 1671256161 = 136534^2 + 40881^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312789317 - 2¹¹ = 20312787269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312789327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156394658 + 10156394659.

It is an arithmetic number, because the mean of its divisors is an integer number (10156394659).

Almost surely, 2^20312789317 is an apocalyptic number.

It is an amenable number.

20312789317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312789317 is an equidigital number, since it uses as much as digits as its factorization.

20312789317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20312789317 in words is "twenty billion, three hundred twelve million, seven hundred eighty-nine thousand, three hundred seventeen".