20303197 has 2 divisors, whose sum is σ = 20303198. Its totient is φ = 20303196.

The previous prime is 20303149. The next prime is 20303203. The reversal of 20303197 is 79130302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 1692601 = 4314^2 + 1301^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303197 - 2⁷ = 20303069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151598 + 10151599.

It is an arithmetic number, because the mean of its divisors is an integer number (10151599).

Almost surely, 2^20303197 is an apocalyptic number.

It is an amenable number.

20303197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303197 is an equidigital number, since it uses as much as digits as its factorization.

20303197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20303197 is about 4505.9069009468. The cubic root of 20303197 is about 272.8065601358.

Adding to 20303197 its reverse (79130302), we get a palindrome (99433499).

The spelling of 20303197 in words is "twenty million, three hundred three thousand, one hundred ninety-seven".