20235435391 has 2 divisors, whose sum is σ = 20235435392. Its totient is φ = 20235435390.

The previous prime is 20235435343. The next prime is 20235435401. The reversal of 20235435391 is 19353453202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20235435391 - 2⁷ = 20235435263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20235435391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20235435491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117717695 + 10117717696.

It is an arithmetic number, because the mean of its divisors is an integer number (10117717696).

Almost surely, 2^20235435391 is an apocalyptic number.

20235435391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20235435391 is an equidigital number, since it uses as much as digits as its factorization.

20235435391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 20235435391 its reverse (19353453202), we get a palindrome (39588888593).

The spelling of 20235435391 in words is "twenty billion, two hundred thirty-five million, four hundred thirty-five thousand, three hundred ninety-one".