14 groups of order 20456.
| SmallGroups | group |
|---|---|
| (20456, 1) | C8×C2557 #35205560 |
| (20456, 2) | C2×C4×C2557 #35205561 |
| (20456, 3) | D4×C2557 #35205562 |
| (20456, 4) | Q8×C2557 #35205563 |
| (20456, 5) | C23×C2557 #35205564 |
| (20456, 6) | #35205565 |
| (20456, 7) | C4×D2557 #35205566 |
| (20456, 8) | C2×Dic2557 #35205567 |
| (20456, 9) | C22⋊D2557 #35205568 |
| (20456, 10) | D10228 #35205569 |
| (20456, 11) | Dic5114 #35205570 |
| (20456, 12) | C22×D2557 #35205571 |
| (20456, 13) | #35205572 |
| (20456, 14) | C2×#23779398 #35205573 |