20712091 has 2 divisors, whose sum is σ = 20712092. Its totient is φ = 20712090.

The previous prime is 20712089. The next prime is 20712113. The reversal of 20712091 is 19021702.

It is an a-pointer prime, because the next prime (20712113) can be obtained adding 20712091 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20712091 - 2¹ = 20712089 is a prime.

Together with 20712089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20712491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356045 + 10356046.

It is an arithmetic number, because the mean of its divisors is an integer number (10356046).

Almost surely, 2^20712091 is an apocalyptic number.

20712091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712091 is an equidigital number, since it uses as much as digits as its factorization.

20712091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20712091 is about 4551.0538340037. The cubic root of 20712091 is about 274.6257874314.

Adding to 20712091 its reverse (19021702), we get a palindrome (39733793).

The spelling of 20712091 in words is "twenty million, seven hundred twelve thousand, ninety-one".