All together: all at the same time.
We always had fun when we were all together.
Altogether: /ˌɔl·təˈɡeð·ər, ˈɔl·təˌɡeð·ər/ (adv) completely or totally
There were altogether 20 people at the dinner.
All together: همه با هم
Altogether: روی هم رفته