20256072313 has 2 divisors, whose sum is σ = 20256072314. Its totient is φ = 20256072312.

The previous prime is 20256072259. The next prime is 20256072323. The reversal of 20256072313 is 31327065202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19570051449 + 686020864 = 139893^2 + 26192^2 .

It is a cyclic number.

It is not a de Polignac number, because 20256072313 - 2¹⁷ = 20255941241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20256072323) 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, 10128036156 + 10128036157.

It is an arithmetic number, because the mean of its divisors is an integer number (10128036157).

Almost surely, 2^20256072313 is an apocalyptic number.

It is an amenable number.

20256072313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20256072313 is an equidigital number, since it uses as much as digits as its factorization.

20256072313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 20256072313 in words is "twenty billion, two hundred fifty-six million, seventy-two thousand, three hundred thirteen".