20443431023 has 2 divisors, whose sum is σ = 20443431024. Its totient is φ = 20443431022.

The previous prime is 20443430963. The next prime is 20443431059. The reversal of 20443431023 is 32013434402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20443431023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20443430983 and 20443431001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443431223) 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, 10221715511 + 10221715512.

It is an arithmetic number, because the mean of its divisors is an integer number (10221715512).

Almost surely, 2^20443431023 is an apocalyptic number.

20443431023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443431023 is an equidigital number, since it uses as much as digits as its factorization.

20443431023 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 26.

Adding to 20443431023 its reverse (32013434402), we get a palindrome (52456865425).

The spelling of 20443431023 in words is "twenty billion, four hundred forty-three million, four hundred thirty-one thousand, twenty-three".