java求一个数的所有因子

public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int i1 = scan.nextInt();
        int sum = 0;
        
        for(int i=1;i<=sqrt(i1);i++){
            if(i1%i==0){
                sum = sum+2;
            }
        }

        System.out.println("因子总个数为: "+sum);
    }