#include <fstream>
#include <vector>
#include <cmath>
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");

struct ans{
    int st,dr;
};

int main()
{
    int T;
    cin >> T;
    while(T--){
        long long nr;
        cin >> nr;
        vector<ans> v;
        for(long long i=2; i*i<2*nr; i++){
            if(2*nr%i==0){
                if(((2*nr/i)-i+1)%2==0 && (2*nr/i)-i+1>0){
                    long long a=((2*nr/i)-i+1)/2;
                    long long b=a+i-1;
                    v.push_back({a,b});
                }
            }
        }
        cout << v.size() << '\n';
        for(long long i=0; i<v.size(); i++){
            cout << v[i].st << " " << v[i].dr << '\n';
        }
    }
}