20320331191 has 2 divisors, whose sum is σ = 20320331192. Its totient is φ = 20320331190.

The previous prime is 20320331093. The next prime is 20320331201. The reversal of 20320331191 is 19113302302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320331191 - 2²¹ = 20318234039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320331791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160165595 + 10160165596.

It is an arithmetic number, because the mean of its divisors is an integer number (10160165596).

Almost surely, 2^20320331191 is an apocalyptic number.

20320331191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320331191 is an equidigital number, since it uses as much as digits as its factorization.

20320331191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 20320331191 its reverse (19113302302), we get a palindrome (39433633493).

The spelling of 20320331191 in words is "twenty billion, three hundred twenty million, three hundred thirty-one thousand, one hundred ninety-one".