20340203291 has 2 divisors, whose sum is σ = 20340203292. Its totient is φ = 20340203290.

The previous prime is 20340203263. The next prime is 20340203297. The reversal of 20340203291 is 19230204302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340203291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20340203291.

It is not a weakly prime, because it can be changed into another prime (20340203297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170101645 + 10170101646.

It is an arithmetic number, because the mean of its divisors is an integer number (10170101646).

Almost surely, 2^20340203291 is an apocalyptic number.

20340203291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340203291 is an equidigital number, since it uses as much as digits as its factorization.

20340203291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 20340203291 its reverse (19230204302), we get a palindrome (39570407593).

The spelling of 20340203291 in words is "twenty billion, three hundred forty million, two hundred three thousand, two hundred ninety-one".