Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C25 · Schur multiplier (H2) = C28 |
| direct product | C2×#66005 |
| Sylow | C5 ⋊ C2×#556 |
1112 conjugacy classes of subgroups.
| transitive degree | μt(G) = 320 |
106 conjugacy classes — view the full character table.
| maximal subgroup of | #11990925, #12065623, #12116065, … |
| maximal normal subgroup of | #11990925, #12065623, #12116065, … |
| maximal quotient of | C2×#10607205, C2×#10608033, C2×#10605889, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 20046);