20310111257 has 2 divisors, whose sum is σ = 20310111258. Its totient is φ = 20310111256.

The previous prime is 20310111229. The next prime is 20310111317. The reversal of 20310111257 is 75211101302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16423960336 + 3886150921 = 128156^2 + 62339^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310111257 - 2⁶ = 20310111193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20310114257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155055628 + 10155055629.

It is an arithmetic number, because the mean of its divisors is an integer number (10155055629).

Almost surely, 2^20310111257 is an apocalyptic number.

It is an amenable number.

20310111257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310111257 is an equidigital number, since it uses as much as digits as its factorization.

20310111257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

Adding to 20310111257 its reverse (75211101302), we get a palindrome (95521212559).

The spelling of 20310111257 in words is "twenty billion, three hundred ten million, one hundred eleven thousand, two hundred fifty-seven".