20235191 has 2 divisors, whose sum is σ = 20235192. Its totient is φ = 20235190.

The previous prime is 20235169. The next prime is 20235197. The reversal of 20235191 is 19153202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20235191 - 2¹⁰ = 20234167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20235197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117595 + 10117596.

It is an arithmetic number, because the mean of its divisors is an integer number (10117596).

Almost surely, 2^20235191 is an apocalyptic number.

20235191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20235191 is an equidigital number, since it uses as much as digits as its factorization.

20235191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20235191 is about 4498.3542546136. The cubic root of 20235191 is about 272.5016289216.

Adding to 20235191 its reverse (19153202), we get a palindrome (39388393).

The spelling of 20235191 in words is "twenty million, two hundred thirty-five thousand, one hundred ninety-one".