20340197 has 2 divisors, whose sum is σ = 20340198. Its totient is φ = 20340196.

The previous prime is 20340179. The next prime is 20340233. The reversal of 20340197 is 79104302.

Together with previous prime (20340179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13205956 + 7134241 = 3634^2 + 2671^2 .

It is a cyclic number.

It is not a de Polignac number, because 20340197 - 2⁸ = 20339941 is a prime.

It is a super-2 number, since 2×20340197² = 827447227997618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170098 + 10170099.

It is an arithmetic number, because the mean of its divisors is an integer number (10170099).

Almost surely, 2^20340197 is an apocalyptic number.

It is an amenable number.

20340197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340197 is an equidigital number, since it uses as much as digits as its factorization.

20340197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20340197 is about 4510.0107538674. The cubic root of 20340197 is about 272.9721780160.

Adding to 20340197 its reverse (79104302), we get a palindrome (99444499).

The spelling of 20340197 in words is "twenty million, three hundred forty thousand, one hundred ninety-seven".