20320210091 has 2 divisors, whose sum is σ = 20320210092. Its totient is φ = 20320210090.

The previous prime is 20320210069. The next prime is 20320210093. The reversal of 20320210091 is 19001202302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320210091 - 2²² = 20316015787 is a prime.

It is a super-3 number, since 3×20320210091³ (a number of 32 digits) contains 333 as substring.

Together with 20320210093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20320210093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160105045 + 10160105046.

It is an arithmetic number, because the mean of its divisors is an integer number (10160105046).

Almost surely, 2^20320210091 is an apocalyptic number.

20320210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320210091 is an equidigital number, since it uses as much as digits as its factorization.

20320210091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20320210091 its reverse (19001202302), we get a palindrome (39321412393).

The spelling of 20320210091 in words is "twenty billion, three hundred twenty million, two hundred ten thousand, ninety-one".