20434343431 has 2 divisors, whose sum is σ = 20434343432. Its totient is φ = 20434343430.

The previous prime is 20434343401. The next prime is 20434343441. The reversal of 20434343431 is 13434343402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434343431 - 2⁹ = 20434342919 is a prime.

It is a super-2 number, since 2×20434343431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20434343393 and 20434343402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20434343401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217171715 + 10217171716.

It is an arithmetic number, because the mean of its divisors is an integer number (10217171716).

Almost surely, 2^20434343431 is an apocalyptic number.

20434343431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434343431 is an equidigital number, since it uses as much as digits as its factorization.

20434343431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 20434343431 its reverse (13434343402), we get a palindrome (33868686833).

The spelling of 20434343431 in words is "twenty billion, four hundred thirty-four million, three hundred forty-three thousand, four hundred thirty-one".