#include <fstream>
#include <vector>
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");
int main()
{
    int t, n, k;
    cin >> t;
    for(int i = 1; i <= t; i ++){
        cin >> n;
        vector <pair<int, int>> v;
        for(int j = 2; 1LL * j * (j + 1) / 2 <= n; j ++){
            int sum = j * (j + 1) / 2;
            if((n - sum) % j == 0){
                v.push_back(make_pair(1 + (n - sum) / j, (n - sum) / j + j));
            }
        }
        cout << v.size() << "\n";
        for(auto &element : v){
            cout << element.first << " " << element.second << "\n";
        }
        v.clear();
    }
    return 0;
}