20312513057 has 2 divisors, whose sum is σ = 20312513058. Its totient is φ = 20312513056.

The previous prime is 20312513017. The next prime is 20312513071. The reversal of 20312513057 is 75031521302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19577886241 + 734626816 = 139921^2 + 27104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312513057 - 2¹⁶ = 20312447521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312513017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156256528 + 10156256529.

It is an arithmetic number, because the mean of its divisors is an integer number (10156256529).

Almost surely, 2^20312513057 is an apocalyptic number.

It is an amenable number.

20312513057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312513057 is an equidigital number, since it uses as much as digits as its factorization.

20312513057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The spelling of 20312513057 in words is "twenty billion, three hundred twelve million, five hundred thirteen thousand, fifty-seven".