#include <bits/stdc++.h>

using namespace std;
ifstream fin("consecutive.in");
ofstream fout("consecutive.out");

int main()
{
    int t;
    fin >> t;
    while (t--) {
        long long s;
        fin >> s;
        vector <pair <long long, long long>> sol;
        for (long long n = 2; n * n <= 2*s; n++) {
            long long p = ((2 * s / n) - n + 1) / 2;
            if ((2 * p + n - 1) * n / 2 == s) {
                sol.push_back({p, p + n - 1});
            }
        }
        fout << sol.size() << '\n';
        for (auto it : sol) {
            fout << it.first << ' ' << it.second << '\n';
        }
    }
    return 0;
}