20311011157 has 2 divisors, whose sum is σ = 20311011158. Its totient is φ = 20311011156.

The previous prime is 20311011053. The next prime is 20311011163. The reversal of 20311011157 is 75111011302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11915687281 + 8395323876 = 109159^2 + 91626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311011157 - 2¹⁹ = 20310486869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311011167) 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, 10155505578 + 10155505579.

It is an arithmetic number, because the mean of its divisors is an integer number (10155505579).

Almost surely, 2^20311011157 is an apocalyptic number.

It is an amenable number.

20311011157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311011157 is an equidigital number, since it uses as much as digits as its factorization.

20311011157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 22.

Adding to 20311011157 its reverse (75111011302), we get a palindrome (95422022459).

The spelling of 20311011157 in words is "twenty billion, three hundred eleven million, eleven thousand, one hundred fifty-seven".