The speakers' power handling is rated at 200 watts. That means they won't melt the voice coils at 200 watts. It's not a quantification of what they need in order to use the speakers. If you grasp the idea that a bigger power amp can drive speakers louder, then you know, whether you know you know it or not, that more power = louder and less power = less loud. If any of your content has any dynamics at all, even if you cranked things to the max all the time, you'd never use full power all the time. If you ever turn down, or simply never listen at make-my-ears-ring forever-levels, you actually use something like a watt or two for the vast majority of your listening pleasure with typically sensitive speakers in typical rooms. Dynamic peaks can of course call for much more (a 16 dB-above-average peak needs 40 times the power as the average sound level).
It's usually safe to assume that speakers are compressing by the time they reach half their rated power handling, which means that somewhere around 100 watts the speakers stop getting 1 dB ouder for each 1 dB hotter the signal gets. They're also probably, if still linear, somewhere around 105 to 110 dB at one meter at that level). Thus, reasonably safe to assume that if you don't want to compress the sound, 100 watts is the max power you can actually use with the speakers and have a chance of remaining linear.
I can't find a sensitivity spec on these speakers, so it's not easy to guess what it would take to drive them to reference levels. Others can chime in on whether the Denon's output at 4 ohms has been tested. My guess, based on past testing of higher-in-the-line Denon receivers (let alone the flagship like this) is that it will handle 4 ohm impedance just fine and unless these are very insensitive speakers, will not sufer audible distortion even at high levels with real multichannel content (versus steady state test signals . . .)