#include <iostream>
#include <stdio.h>
#include <cmath>

#define NMAX 350000

using namespace std;

long long N, k, sn, m, L, i, j, numar, T, x;
long long lungime[NMAX], stanga[NMAX];
long long n;

int main() {
    freopen("consecutive.in", "r", stdin);
    freopen("consecutive.out", "w", stdout);

    scanf("%d", &T);

    while(T--) {
        k = 0; numar = 0;
        scanf("%d", &N);

        sn = 2 * sqrt(N);
        for(L = 2; L <= sn; ++ L) {
            n = 2 * N + L * L + L;
            if(n % (2*L) == 0) {
                x = (2*N - (L*L - L)) / (2 * L);
                if(x > 0) {
                    stanga[k++] = x;
                    lungime[k - 1] = L;
                    numar ++;
                }
            }
        }
        printf("%d\n", numar);

        for(i = 0; i < k; ++i) {
            printf("%d %d\n", stanga[i], stanga[i] + lungime[i] - 1);
        }
    }

    return 0;
}