20310091 has 2 divisors, whose sum is σ = 20310092. Its totient is φ = 20310090.

The previous prime is 20310089. The next prime is 20310119. The reversal of 20310091 is 19001302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20310091 - 2¹ = 20310089 is a prime.

Together with 20310089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20310001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155045 + 10155046.

It is an arithmetic number, because the mean of its divisors is an integer number (10155046).

Almost surely, 2^20310091 is an apocalyptic number.

20310091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310091 is an equidigital number, since it uses as much as digits as its factorization.

20310091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 20310091 is about 4506.6718318511. The cubic root of 20310091 is about 272.8374340190.

Adding to 20310091 its reverse (19001302), we get a palindrome (39311393).

The spelling of 20310091 in words is "twenty million, three hundred ten thousand, ninety-one".