20313131123 has 2 divisors, whose sum is σ = 20313131124. Its totient is φ = 20313131122.

The previous prime is 20313131029. The next prime is 20313131159. The reversal of 20313131123 is 32113131302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20313131123 - 2¹⁰ = 20313130099 is a prime.

It is a super-2 number, since 2×20313131123² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20313131095 and 20313131104.

It is not a weakly prime, because it can be changed into another prime (20313131023) 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, 10156565561 + 10156565562.

It is an arithmetic number, because the mean of its divisors is an integer number (10156565562).

Almost surely, 2^20313131123 is an apocalyptic number.

20313131123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313131123 is an equidigital number, since it uses as much as digits as its factorization.

20313131123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20313131123 its reverse (32113131302), we get a palindrome (52426262425).

The spelling of 20313131123 in words is "twenty billion, three hundred thirteen million, one hundred thirty-one thousand, one hundred twenty-three".