#include<fstream>
using namespace std;
int t, n, i, x, nr;
pair<int, int> sol[30000];
ifstream fin("consecutive.in");
ofstream fout("consecutive.out");
int main(){
    fin>> t;
    for(; t; t--){
        fin>> n;
        nr = 0;
        for(i = 2; i <= n; i++){
            x = i * 1LL * (i + 1) / 2;
            if(x > n){
                break;
            }
            x = n - i * (i - 1) / 2;
            if(x % i == 0){
                nr++;
                sol[nr].first = x / i;
                sol[nr].second = sol[nr].first + i - 1;
            }
        }
        fout<< nr <<"\n";
        for(i = 1; i <= nr; i++){
            fout<< sol[i].first <<" "<< sol[i].second <<"\n";
        }
    }
}