20309297 has 2 divisors, whose sum is σ = 20309298. Its totient is φ = 20309296.

The previous prime is 20309281. The next prime is 20309327. The reversal of 20309297 is 79290302.

20309297 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16638241 + 3671056 = 4079^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 20309297 - 2⁴ = 20309281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20309797) 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, 10154648 + 10154649.

It is an arithmetic number, because the mean of its divisors is an integer number (10154649).

Almost surely, 2^20309297 is an apocalyptic number.

It is an amenable number.

20309297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309297 is an equidigital number, since it uses as much as digits as its factorization.

20309297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20309297 is about 4506.5837393751. The cubic root of 20309297 is about 272.8338785492.

Adding to 20309297 its reverse (79290302), we get a palindrome (99599599).

The spelling of 20309297 in words is "twenty million, three hundred nine thousand, two hundred ninety-seven".