Mobile App - Best approach to display 20000 data items

I made an application to scan malware and dangerous files on Android devices. In worse case, there may be over 1000 infected items (even more) to show. I don't ask about correctness of scanning engine, I want to find some ideas how should I display scanning result to users. I mean, assume I find 1000 or 20.000 infected items, which is the good approach to display them to users. A flat list of 20k items is not readable, I think. This question may not have 100% exactly answer, but I hope we can find some good ideas/experience to solve it.

Thanks.