Extensions 1→N→G→Q→1 with N=C20 and Q=C18

Direct product G=N×Q with N=C20 and Q=C18
dρLabelID
C2×C180360C2xC180360,30

Semidirect products G=N:Q with N=C20 and Q=C18
extensionφ:Q→Aut NdρLabelID
C201C18 = C9×D20φ: C18/C9C2 ⊆ Aut C201802C20:1C18360,17
C202C18 = D5×C36φ: C18/C9C2 ⊆ Aut C201802C20:2C18360,16
C203C18 = D4×C45φ: C18/C9C2 ⊆ Aut C201802C20:3C18360,31

Non-split extensions G=N.Q with N=C20 and Q=C18
extensionφ:Q→Aut NdρLabelID
C20.1C18 = C9×Dic10φ: C18/C9C2 ⊆ Aut C203602C20.1C18360,15
C20.2C18 = C9×C52C8φ: C18/C9C2 ⊆ Aut C203602C20.2C18360,2
C20.3C18 = Q8×C45φ: C18/C9C2 ⊆ Aut C203602C20.3C18360,32

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