20260091 has 2 divisors, whose sum is σ = 20260092. Its totient is φ = 20260090.

The previous prime is 20260021. The next prime is 20260117. The reversal of 20260091 is 19006202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20260091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20260001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130045 + 10130046.

It is an arithmetic number, because the mean of its divisors is an integer number (10130046).

Almost surely, 2^20260091 is an apocalyptic number.

20260091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20260091 is an equidigital number, since it uses as much as digits as its factorization.

20260091 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.

The square root of 20260091 is about 4501.1210825749. The cubic root of 20260091 is about 272.6133568728.

Adding to 20260091 its reverse (19006202), we get a palindrome (39266293).

The spelling of 20260091 in words is "twenty million, two hundred sixty thousand, ninety-one".