20320321243 has 2 divisors, whose sum is σ = 20320321244. Its totient is φ = 20320321242.

The previous prime is 20320321213. The next prime is 20320321247. The reversal of 20320321243 is 34212302302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320321243 - 2⁹ = 20320320731 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320321247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160160621 + 10160160622.

It is an arithmetic number, because the mean of its divisors is an integer number (10160160622).

Almost surely, 2^20320321243 is an apocalyptic number.

20320321243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320321243 is an equidigital number, since it uses as much as digits as its factorization.

20320321243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20320321243 its reverse (34212302302), we get a palindrome (54532623545).

The spelling of 20320321243 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, two hundred forty-three".