#include <bits/stdc++.h>
using namespace std;
long long rdtsc() {
  long long tmp;
  asm("rdtsc" : "=A"(tmp));
  return tmp;
}
inline int myrand() { return abs((rand() << 15) ^ rand()); }
inline int rnd(int x) { return myrand() % x; }
const int INF = (int)1.01e9;
const long double EPS = 1e-9;
void precalc() {}
long long x;
bool read() {
  if (scanf("%lld", &x) < 1) {
    return 0;
  }
  return 1;
}
void solve() {
  vector<pair<long long, long long> > ans;
  for (long long t = 1;; ++t) {
    long long a = t * (t + 1) / 2;
    long long b = a * (2 * t + 1) / 3;
    if (b > x) {
      break;
    }
    long long left = x - b;
    if (left % a) {
      continue;
    }
    left /= a;
    ans.push_back(make_pair(t, t + left));
    if (left) {
      ans.push_back(make_pair(t + left, t));
    }
  }
  printf("%d\n", ((int)(ans).size()));
  sort(ans.begin(), ans.end());
  for (int i = 0; i < ((int)(ans).size()); ++i) {
    printf(
        "%lld"
        " "
        "%lld"
        "\n",
        ans[i].first, ans[i].second);
  }
}
int main() {
  srand(rdtsc());
  precalc();
  while (1) {
    if (!read()) {
      break;
    }
    solve();
  }
  return 0;
}
