20431242563 has 2 divisors, whose sum is σ = 20431242564. Its totient is φ = 20431242562.

The previous prime is 20431242553. The next prime is 20431242589. The reversal of 20431242563 is 36524213402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431242563 - 2⁶ = 20431242499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20431242553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215621281 + 10215621282.

It is an arithmetic number, because the mean of its divisors is an integer number (10215621282).

Almost surely, 2^20431242563 is an apocalyptic number.

20431242563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431242563 is an equidigital number, since it uses as much as digits as its factorization.

20431242563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 20431242563 its reverse (36524213402), we get a palindrome (56955455965).

The spelling of 20431242563 in words is "twenty billion, four hundred thirty-one million, two hundred forty-two thousand, five hundred sixty-three".