No idea, since that isn't a valid IP address. IPv4 is xxx.xxx.xxx.xxx and you just listed a xxx.xxx.xxx.xxx.xxx address.
If that was a valid IP, the network address would be what you displayed. The IP broadcast would be (IIRC) xxx.xxx.255.255 and the subnet mask would be 255.255.0.0, since you are dealing with a /20 block and not a /24 block. But, could be wrong on that, I almost never deal with anything other than /24 blocks.