20526131257 has 2 divisors, whose sum is σ = 20526131258. Its totient is φ = 20526131256.

The previous prime is 20526131239. The next prime is 20526131261. The reversal of 20526131257 is 75213162502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14046042256 + 6480089001 = 118516^2 + 80499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20526131257 - 2¹¹ = 20526129209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20526131237) 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, 10263065628 + 10263065629.

It is an arithmetic number, because the mean of its divisors is an integer number (10263065629).

Almost surely, 2^20526131257 is an apocalyptic number.

It is an amenable number.

20526131257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20526131257 is an equidigital number, since it uses as much as digits as its factorization.

20526131257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

Adding to 20526131257 its reverse (75213162502), we get a palindrome (95739293759).

The spelling of 20526131257 in words is "twenty billion, five hundred twenty-six million, one hundred thirty-one thousand, two hundred fifty-seven".