20310197 has 2 divisors, whose sum is σ = 20310198. Its totient is φ = 20310196.

The previous prime is 20310193. The next prime is 20310209. The reversal of 20310197 is 79101302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 320356 = 4471^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310197 - 2² = 20310193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155098 + 10155099.

It is an arithmetic number, because the mean of its divisors is an integer number (10155099).

Almost surely, 2^20310197 is an apocalyptic number.

It is an amenable number.

20310197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310197 is an equidigital number, since it uses as much as digits as its factorization.

20310197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20310197 is about 4506.6835921773. The cubic root of 20310197 is about 272.8379086717.

Adding to 20310197 its reverse (79101302), we get a palindrome (99411499).

The spelling of 20310197 in words is "twenty million, three hundred ten thousand, one hundred ninety-seven".