20330291 has 2 divisors, whose sum is σ = 20330292. Its totient is φ = 20330290.

The previous prime is 20330237. The next prime is 20330309. The reversal of 20330291 is 19203302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20330201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165145 + 10165146.

It is an arithmetic number, because the mean of its divisors is an integer number (10165146).

Almost surely, 2^20330291 is an apocalyptic number.

20330291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330291 is an equidigital number, since it uses as much as digits as its factorization.

20330291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20330291 is about 4508.9123965764. The cubic root of 20330291 is about 272.9278568870.

Adding to 20330291 its reverse (19203302), we get a palindrome (39533593).

The spelling of 20330291 in words is "twenty million, three hundred thirty thousand, two hundred ninety-one".