#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("consecutive.in");
ofstream g("consecutive.out");
long long t,n,nr,i,a;
vector < pair<long long,long long> >v;
int main()
{
    f>>t;
    while(t--)
    {
        f>>n;
        nr=0;
        for(i=1;i*(i+1)<2*n;i++)
        {
            if((2*n-i*(i+1))%(2*(i+1))==0)
            {
                nr++;
                a=(2*n-i*(i+1))/(2*(i+1));
                v.push_back({a,a+i});
            }
        }
        g<<nr<<"\n";
        for(i=0;i<v.size();i++)
        {
            g<<v[i].first<<" "<<v[i].second<<"\n";
        }
    }
    return 0;
}