By 2020, I think you'll be a millionaire with one tenth of that. 2020 should bring Bitcoin somewhere close to $100,000 in today's value. Even if I'm wrong by a factor of 2 or 3, I'll still be very happy about it
You should be realistic. That's only possible if the exponential growth of the past years can keep up. Considering the market cap that comes with it, I would count on being a millionaire by 2020 with 10 coins.