Extensions 1→N→G→Q→1 with N=C₂₁ and Q=C₂₀

Direct product G=NxQ with N=C₂₁ and Q=C₂₀

		d	ρ	Label	ID
C₄₂₀		420	1	C420	420,12

Semidirect products G=N:Q with N=C₂₁ and Q=C₂₀

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂₁:₁C₂₀ = C₅xDic₂₁	φ: C₂₀/C₁₀ → C₂ ⊆ Aut C₂₁	420	2	C21:1C20	420,9
C₂₁:₂C₂₀ = C₁₅xDic₇	φ: C₂₀/C₁₀ → C₂ ⊆ Aut C₂₁	420	2	C21:2C20	420,5
C₂₁:₃C₂₀ = Dic₃xC₃₅	φ: C₂₀/C₁₀ → C₂ ⊆ Aut C₂₁	420	2	C21:3C20	420,8

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