#include <fstream>
#include <vector>
#include <cstdint>
#define int unsigned long long
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");
int32_t main()
{
    int t;
    cin>>t;
    while(t--){
        vector<pair<int,int>>ans;
        int n;
        cin>>n;
        n*=2;
        for(int d=2;d*d<=n;d++){
            if(n%d) continue;
            int x=d,y=n/d;
            int p,u;
            if((y-x+1)%2) continue;
            p=(y-x+1)/2;
            u=y-p;
            ans.push_back({p,u});
        }
        cout<<ans.size()<<'\n';
        for(auto e:ans){
            cout<<e.first<<" "<<e.second<<'\n';
        }
    }
    return 0;
}
/// x*a+1+2+3+...+x=x*a+x*(x+1)/2=x*(a+(x+1)/2)=n