Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C25 · Schur multiplier (H2) = C28×C4 |
| direct product | C2×#66139 |
| Fitting | C23×C5×D4 ⋊ C2 |
| Sylow | C5 ⋊ C2×#535 |
| subgroup | G/H | |
|---|---|---|
| center | C23 | C23×D5 |
| commutator, cosocle | C22×C5 | C25 |
| Frattini | C22 | C24×D5 |
| Fitting | C23×C5×D4 | C2 |
| socle | C23×C5 | C24 |
| hypercenter | C23×D4 | D5 |
| hypocenter | C5 | C2×#535 |
| LCS | G ▷ C22×C5 ▷ C5 | |
| UCS | C1 ◁ C23 ◁ C23×D4 | |
1896 conjugacy classes of subgroups.
| transitive degree | μt(G) = 160 |
124 conjugacy classes — view the full character table.
| maximal subgroup of | #12005825, #12005873, #12005888, … |
| maximal normal subgroup of | #12005825, #12005873, #12005888, … |
| maximal quotient of | C2×#10615775, C2×#10613917, C2×#10613888, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 21220);