#include <bits/stdc++.h>
using namespace std;
vector<pair<long long, long long> > v;
long long x;
long long k;
int broj;
int main(void) {
  cin >> x;
  k = 0;
  long long i = 1;
  for (long long i = 1; i <= sqrt(x); ++i) {
    if (k + i * i > (1000000000000000000)) goto van;
    k = k + i * i;
    if (x - k < 0) goto van;
    if ((2 * (x - k)) % (i * (i + 1)) == 0) {
      v.push_back(
          pair<long long, long long>(i, i + (2 * (x - k)) / (i * (i + 1))));
    }
  }
van:;
  for (int i = 0; i < v.size(); ++i) {
    broj++;
  }
  for (int i = v.size() - 1; i >= 0; --i) {
    if (v[i].second == v[i].first) continue;
    broj++;
  }
  cout << broj << endl;
  for (int i = 0; i < v.size(); ++i) {
    broj++;
    cout << v[i].first << " " << v[i].second << endl;
  }
  for (int i = v.size() - 1; i >= 0; --i) {
    if (v[i].second == v[i].first) continue;
    broj++;
    cout << v[i].second << " " << v[i].first << endl;
  }
  return 0;
}
