The number of analysts suggests buying a particular stock out of the total analysts who have researched the stock.
Different stocks have different no of analysts tracking them. Each analyst gives a different rating and a target price, which is then averaged and presented on the platform. These analyst ratings are mostly revised/updated after quarterly/yearly results.
We have similar filters like % of analysts giving buy and sell recommendations, but this absolute value additionally gives an idea of how many analysts are covering the stock.