20313020257 has 2 divisors, whose sum is σ = 20313020258. Its totient is φ = 20313020256.

The previous prime is 20313020237. The next prime is 20313020291. The reversal of 20313020257 is 75202031302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20311665361 + 1354896 = 142519^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313020257 - 2¹⁹ = 20312495969 is a prime.

It is a super-2 number, since 2×20313020257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20313020237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156510128 + 10156510129.

It is an arithmetic number, because the mean of its divisors is an integer number (10156510129).

Almost surely, 2^20313020257 is an apocalyptic number.

It is an amenable number.

20313020257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313020257 is an equidigital number, since it uses as much as digits as its factorization.

20313020257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

Adding to 20313020257 its reverse (75202031302), we get a palindrome (95515051559).

The spelling of 20313020257 in words is "twenty billion, three hundred thirteen million, twenty thousand, two hundred fifty-seven".