20313540857 has 2 divisors, whose sum is σ = 20313540858. Its totient is φ = 20313540856.

The previous prime is 20313540853. The next prime is 20313540881. The reversal of 20313540857 is 75804531302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18129006736 + 2184534121 = 134644^2 + 46739^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313540857 - 2² = 20313540853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20313540857.

It is not a weakly prime, because it can be changed into another prime (20313540853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156770428 + 10156770429.

It is an arithmetic number, because the mean of its divisors is an integer number (10156770429).

Almost surely, 2^20313540857 is an apocalyptic number.

It is an amenable number.

20313540857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313540857 is an equidigital number, since it uses as much as digits as its factorization.

20313540857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 20313540857 in words is "twenty billion, three hundred thirteen million, five hundred forty thousand, eight hundred fifty-seven".