#include <fstream>
#include <cmath>
#include <vector>
#include <utility>
#include <algorithm>
using namespace std;

long long n,m,i,j,t,e,sum,k;

vector< pair<long, long> > a;
int main()
{

    ifstream fin("consecutive.in");
    ofstream fout("consecutive.out");
    fin>>t;
    for(e=1;e<=t;e++)
    {
        a.clear();
        fin>>n;
        for(i=n/2 + 1;i>=1;i--)
        {
            sum = (i * (i + 1) / 2 - n) * 2;
            k = (-1 + sqrt(1+4*sum))/2;
            if((i*(i+1)/2 - k*(k+1)/2) == n)
            {
                if(i != k + 1)
                {
                    a.push_back({k+1,i});
                }
            }
        }
        fout<<a.size()<<"\n";
        for(i=0;i<a.size();++i)
        {
            fout<<a[i].first<<" "<<a[i].second<<"\n";
        }
    }
    return 0;
}