20311320413 has 2 divisors, whose sum is σ = 20311320414. Its totient is φ = 20311320412.

The previous prime is 20311320389. The next prime is 20311320443. The reversal of 20311320413 is 31402311302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17244154489 + 3067165924 = 131317^2 + 55382^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311320413 - 2⁸ = 20311320157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311320443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155660206 + 10155660207.

It is an arithmetic number, because the mean of its divisors is an integer number (10155660207).

Almost surely, 2^20311320413 is an apocalyptic number.

It is an amenable number.

20311320413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311320413 is an equidigital number, since it uses as much as digits as its factorization.

20311320413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20311320413 its reverse (31402311302), we get a palindrome (51713631715).

The spelling of 20311320413 in words is "twenty billion, three hundred eleven million, three hundred twenty thousand, four hundred thirteen".