20297 has 2 divisors, whose sum is σ = 20298.
Its totient is φ = 20296.
The previous prime is 20287. The next prime is 20323. The reversal of 20297 is 79202.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 17161 + 3136 = 131^2 + 56^2
It is a cyclic number.
It is not a de Polignac number, because 20297 - 26 = 20233 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (20287) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148 + 10149.
It is an arithmetic number, because the mean of its divisors is an integer number (10149).
220297 is an apocalyptic number.
It is an amenable number.
20297 is a deficient number, since it is larger than the sum of its proper divisors (1).
20297 is an equidigital number, since it uses as much as digits as its factorization.
20297 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 252, while the sum is 20.
The square root of 20297 is about 142.4675401627.
The cubic root of 20297 is about 27.2778801711.
Adding to 20297 its reverse (79202), we get a palindrome (99499).
The spelling of 20297 in words is "twenty thousand, two hundred ninety-seven".