20311432013 has 2 divisors, whose sum is σ = 20311432014. Its totient is φ = 20311432012.

The previous prime is 20311431991. The next prime is 20311432019. The reversal of 20311432013 is 31023411302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17067332164 + 3244099849 = 130642^2 + 56957^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311432013 - 2¹⁰ = 20311430989 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 (20311432019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155716006 + 10155716007.

It is an arithmetic number, because the mean of its divisors is an integer number (10155716007).

Almost surely, 2^20311432013 is an apocalyptic number.

It is an amenable number.

20311432013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311432013 is an equidigital number, since it uses as much as digits as its factorization.

20311432013 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 20311432013 its reverse (31023411302), we get a palindrome (51334843315).

The spelling of 20311432013 in words is "twenty billion, three hundred eleven million, four hundred thirty-two thousand, thirteen".