This is the 1742nd most frequent Russian word.
двоих
"Двоих" means "two people" or "the two" in English, often used in the accusative or genitive case.
The word 'двоих' in this sentence is used in the accusative case to indicate two people who are directly affected by the action of inviting.
Я пригласил двоих друзей на ужин.
I invited two friends to dinner.
Here, 'двоих' appears in the genitive case, which is used after the preposition 'о' (about), to specify the topic of discussion involving two individuals.
Мы разговаривали о двоих коллегах.
We talked about two colleagues.
In this example, 'двоих' is again in the accusative case, used to describe the direct object of 'seeing'— two individuals.