20031323131 has 2 divisors, whose sum is σ = 20031323132. Its totient is φ = 20031323130.

The previous prime is 20031323113. The next prime is 20031323171. The reversal of 20031323131 is 13132313002.

Together with previous prime (20031323113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20031323131 - 2⁵ = 20031323099 is a prime.

It is a super-2 number, since 2×20031323131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20031323099 and 20031323108.

It is not a weakly prime, because it can be changed into another prime (20031323111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015661565 + 10015661566.

It is an arithmetic number, because the mean of its divisors is an integer number (10015661566).

Almost surely, 2^20031323131 is an apocalyptic number.

20031323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031323131 is an equidigital number, since it uses as much as digits as its factorization.

20031323131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20031323131 its reverse (13132313002), we get a palindrome (33163636133).

The spelling of 20031323131 in words is "twenty billion, thirty-one million, three hundred twenty-three thousand, one hundred thirty-one".