Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Score | Result | Attendance | Record |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | June 26 | Montreal Alouettes | 33–10 | Loss | 20,589 | 0–1 |
| 2.0 | July 3 | at Toronto Argonauts | 32–13 | Win | 30,822 | 1–1 |
| 3.0 | July 12 | Saskatchewan Roughriders | 33–28 | Loss | 20,874 | 1–2 |
| 4.0 | July 17 | at Calgary Stampeders | 43–16 | Loss | 31,116 | 1–3 |
| 5.0 | July 24 | Edmonton Eskimos | 19–13 | Loss | 21,402 | 1–4 |
| 6.0 | July 31 | at Montreal Alouettes | 40–33 | Loss | 20,202 | 1–5 |
| 7.0 | Aug 7 | Toronto Argonauts | 45–21 | Win | 19,423 | 2–5 |
| 8.0 | Aug 14 | at Winnipeg Blue Bombers | 37–24 | Loss | 25,484 | 2–6 |
| 9.0 | Bye | Bye | Bye | Bye | Bye | Bye |
| 10.0 | Sept 1 | Toronto Argonauts | 34–31 | Loss | 25,911 | 2–7 |
| 11.0 | Sept 6 | BC Lions | 35–12 | Loss | 18,723 | 2–8 |
| 12.0 | Sept 13 | at Edmonton Eskimos | 38–33 | Loss | 37,500 | 2–9 |
| 13.0 | Sept 19 | Winnipeg Blue Bombers | 25–23 | Loss | 19,102 | 2–10 |
| 14.0 | Sept 27 | at BC Lions | 40–10 | Loss | 31,161 | 2–11 |
| 15.0 | Oct 4 | Montreal Alouettes | 44–36 | Win | 20,423 | 3–11 |
| 16.0 | Oct 13 | at Montreal Alouettes | 42–11 | Loss | 20,202 | 3–12 |
| 17.0 | Oct 19 | at Saskatchewan Roughriders | 30–29 | Loss | 30,945 | 3–13 |
| 18.0 | Oct 24 | Calgary Stampeders | 28–17 | Loss | 20,614 | 3–14 |
| 19.0 | Nov 1 | at Winnipeg Blue Bombers | 44–30 | Loss | 24,595 | 3–15 |
Question:
What is Attendance, when Opponent is Montreal Alouettes, and when Date is Oct 4?
Answer:
20423.0