#include <fstream>
#include <math.h>
using namespace std;
ifstream f("consecutive.in");
ofstream g("consecutive.out");
long long T,n,k,i,nrsol,t,sol[2][100001];
int main()
{
    f>>T;
    for(t=1;t<=T;t++){
            nrsol=0;
            f>>n;
        for(k=2;k<=sqrt(2*n);k++)
        {
            if(((2*n+k-k*k)%(2*k)==0)&&((2*n+k-k*k)/(2*k)>0)){
                sol[0][++nrsol]=(2*n+k-k*k)/(2*k);
                sol[1][nrsol]=sol[0][nrsol]+k-1;
            }
        }
    g<<nrsol<<'\n';
    for(i=1;i<=nrsol;i++)
        g<<sol[0][i]<<" "<<sol[1][i]<<'\n';

    }
    return 0;
}