Two factors.
The Battle of Britain was predominately fought between the British RAF and the German Luftwaffe assisted by the Italian Air Force.Other main weapons in the battle were Chain-Home Radar Network, British Observer Corps and British Anti-Aircraft Artillary.The RAFThe two mainstay fighters for the RAF wereHawker Hurricane - Mk1Supermarine Spitfire - Mk1 and Mk2.Also used by the RAF were.Bristol Blenheim - Mk1f. Night Fighter variant of Mk1.Bristol Beaufighter - Mk1Boulton Paul Defiant - Mk1Gloster GladiatorThe LuftwaffeFor the Germans this was a battle for bombers. The fighters were there mostly to protect the bombers and maybe wining air superiority from British Fighter Command.German BombersDornier Do17 - Varients Do17-M, Do17-P, Do17-Z2 & Do17-Z-3Dornier Do18 - Do18-D1Heinkel He111 - He111-H2, He111-H3, He111-H4 & He111-P1Junkers Ju87 Stuka - Ju87-B1 & Ju87-B2Junkers Ju88 - Ju88-A1 & Ju88-42Italian BombersFiat BR20M CicognaGerman FightersMesserschmit Bf109 - Bf109-E1, Bf109-E1B, Bf109-E3, Bf109-E4, Bf109-E4B, Bf109-E4N, Bf109-E7, Bf109-E7N & Bf109-F1Messerschmit Bf110 - Bf110-C4, Bf110-C4B & Bf110-C5Italian FightersFiat CR.42 FalcoFiat G.50 FrecciaOther German PlanesBreguet 521 Bizerte- Reconnaissance (French built)Focke-Wulf Fw200-C3 - Reconnaissance and Anti-Shipping Bomber.Heinkel He59-C2 - Torpedo Bomber.
Six factors.
There can be infinitely many distinct factors.
the factors are 1,2,3,4,6,8,12,24 and it has 8 factors
Seven factors.
10 factors
Two factors.
24 factors.
56 factors
Two factors.
Six factors.
Four factors.