#include <fstream>
#include <cmath>
using namespace std;

ifstream cin("consecutive.in");
ofstream cout("consecutive.out");

int a[100001][3];

int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		int n,k=1,ct=0;
		cin>>n;
		int L = sqrt(2*n);
		for(int i=2;i<=L;i++)
		{
			int remaining = n-(i*(i+1)/2);
			if(remaining%i==0)
			{
				ct++;
				a[k][1]=remaining/i+1;
				a[k][2]=remaining/i+i;
				k++;
			}
		}
		cout<<ct<<"\n";
		for(int i=1;i<k;i++)
		{
			cout<<a[i][1]<<" "<<a[i][2]<<"\n";
			a[i][1]=0;
			a[i][2]=0;
		}
		
	}
	return 0;
}