20204243431 has 2 divisors, whose sum is σ = 20204243432. Its totient is φ = 20204243430.

The previous prime is 20204243413. The next prime is 20204243513. The reversal of 20204243431 is 13434240202.

It is a happy number.

Together with previous prime (20204243413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20204243431 - 2⁵ = 20204243399 is a prime.

It is a super-2 number, since 2×20204243431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20204243396 and 20204243405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20204253431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102121715 + 10102121716.

It is an arithmetic number, because the mean of its divisors is an integer number (10102121716).

Almost surely, 2^20204243431 is an apocalyptic number.

20204243431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204243431 is an equidigital number, since it uses as much as digits as its factorization.

20204243431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20204243431 its reverse (13434240202), we get a palindrome (33638483633).

The spelling of 20204243431 in words is "twenty billion, two hundred four million, two hundred forty-three thousand, four hundred thirty-one".