20431043131 has 2 divisors, whose sum is σ = 20431043132. Its totient is φ = 20431043130.

The previous prime is 20431043093. The next prime is 20431043137. The reversal of 20431043131 is 13134013402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431043131 is a prime.

It is a super-2 number, since 2×20431043131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20431043137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215521565 + 10215521566.

It is an arithmetic number, because the mean of its divisors is an integer number (10215521566).

Almost surely, 2^20431043131 is an apocalyptic number.

20431043131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431043131 is an equidigital number, since it uses as much as digits as its factorization.

20431043131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20431043131 its reverse (13134013402), we get a palindrome (33565056533).

The spelling of 20431043131 in words is "twenty billion, four hundred thirty-one million, forty-three thousand, one hundred thirty-one".