I doubt it's a mere 20k. Granted it's not perfect with that 14%, but it is HP^50%, plus it has a perfect shelter mod to boot. Some say it's around 70k., but I hope to get more responses to confirm or deny.
70 is way too high. 15^50 r9 doesn't really go for 70. I think the initial assesment is about right. Because its r8 I might say a little more, but in an interval around 20 sounds right.