Finite Group DatabasebetaFinite Group Databasebeta| order | 19820 |
| automorphism | ? |
| homology | Abelianization (H1) = C4×C5 · Schur multiplier (H2) = C1 |
| unambiguous semidirect product | Dic991⋊C5 |
| unambiguous semidirect product | (C991⋊C5)⋊C4 |
| derived, Sylow | C991 ⋊ C4×C5 |
| Hall | C991⋊C5 ⋊ C4 |
| Hall | Dic991 ⋊ C5 |
| subgroup | G/H | |
|---|---|---|
| center, Frattini, hypercenter | C2 | D991⋊C5 |
| commutator, hypocenter | C991 | C4×C5 |
| Fitting, socle, cosocle | C2×C991 | C2×C5 |
| prime radical | C2×C991⋊C5 | C2 |
| LCS | G ▷ C991 | |
| UCS | C1 ◁ C2 | |
12 conjugacy classes of subgroups.
| transitive degree | μt(G) = 3964 |
Polycyclic presentation:
2,5,991,2|a^2=d,c^a=c^990,c^b=c^825218 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(19820, 2);