#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<vector>
#include<cstdio>
#include <cmath>
#include<algorithm>

using namespace std;
struct solutie
{
	int st, dr;
};
vector <long long> s;
vector < pair <int, int> > sol;
int nrsol;
void Sume()
{
	long long maxi = pow(2, 31);
	long long suma = 0;
	int i;
	s.push_back(0);
	for (i = 1; suma<=maxi; ++i)
	{
		
		suma = suma + i;
		
		s.push_back(suma);
	}
}
int CautBin(int n)
{
	int st, dr, m;
	st = 1;
	if (n > s.size()) dr = s.size() - 1;
	else  dr = n;
	while (st <= dr)
	{
		m = (st + dr) / 2;
		//printf("%d %d %d\n", st, dr, m);
		if (s[m] == n) return m;
		else if (s[m] < n) st = m + 1;
		else if (s[m] > n) dr = m - 1;
	}
	return m;
}
bool Comp(solutie x, solutie y)
{
	return (x.dr - x.st) < (y.dr - y.st);
}
int alg(int n)
{
	int d = 2;
	int nrsol = 0;
	while (n / d - d / 2 >= 1)
	{
		int mij = n / d;
		int st, dr;
		if (d % 2 == 1)
		{
			st = mij - (d / 2 );
			dr = mij + (d / 2);
		}
		else
		{
			dr = mij + (d / 2);
			st = mij - (d / 2 - 1);
		}
		if (dr*(dr + 1) / 2 - (st - 1)*st / 2 == n)
		{
			nrsol++;
			sol.push_back(make_pair(st, dr));
		}
		d++;
	}
	return nrsol;
}
int main()
{
	freopen("consecutive.in", "r", stdin);
	freopen("consecutive.out", "w", stdout);
	int test,n;
	scanf("%d", &test);
	for (int t = 1; t <= test; t++)
	{
		scanf("%d", &n);
		sol.clear();
		printf("%d\n", alg(n));
		for (int i = 0; i < sol.size(); i++)
		{
			printf("%d %d\n", sol[i].first, sol[i].second);
		}
	}
	
}