20431242163 has 2 divisors, whose sum is σ = 20431242164. Its totient is φ = 20431242162.

The previous prime is 20431242151. The next prime is 20431242233. The reversal of 20431242163 is 36124213402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431242163 - 2¹³ = 20431233971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20431242563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215621081 + 10215621082.

It is an arithmetic number, because the mean of its divisors is an integer number (10215621082).

Almost surely, 2^20431242163 is an apocalyptic number.

20431242163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431242163 is an equidigital number, since it uses as much as digits as its factorization.

20431242163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 20431242163 its reverse (36124213402), we get a palindrome (56555455565).

The spelling of 20431242163 in words is "twenty billion, four hundred thirty-one million, two hundred forty-two thousand, one hundred sixty-three".