20311455013 has 2 divisors, whose sum is σ = 20311455014. Its totient is φ = 20311455012.

The previous prime is 20311454959. The next prime is 20311455061. The reversal of 20311455013 is 31055411302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653221409 + 6658233604 = 116847^2 + 81598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311455013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311455113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155727506 + 10155727507.

It is an arithmetic number, because the mean of its divisors is an integer number (10155727507).

Almost surely, 2^20311455013 is an apocalyptic number.

It is an amenable number.

20311455013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311455013 is an equidigital number, since it uses as much as digits as its factorization.

20311455013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20311455013 its reverse (31055411302), we get a palindrome (51366866315).

The spelling of 20311455013 in words is "twenty billion, three hundred eleven million, four hundred fifty-five thousand, thirteen".