20316308557 has 2 divisors, whose sum is σ = 20316308558. Its totient is φ = 20316308556.

The previous prime is 20316308539. The next prime is 20316308611. The reversal of 20316308557 is 75580361302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17274896356 + 3041412201 = 131434^2 + 55149^2 .

It is a cyclic number.

It is not a de Polignac number, because 20316308557 - 2¹¹ = 20316306509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20316308357) 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, 10158154278 + 10158154279.

It is an arithmetic number, because the mean of its divisors is an integer number (10158154279).

Almost surely, 2^20316308557 is an apocalyptic number.

It is an amenable number.

20316308557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20316308557 is an equidigital number, since it uses as much as digits as its factorization.

20316308557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

Adding to 20316308557 its reverse (75580361302), we get a palindrome (95896669859).

The spelling of 20316308557 in words is "twenty billion, three hundred sixteen million, three hundred eight thousand, five hundred fifty-seven".