Sorry to inform you, but this has been done a number of times. The point that Hitler dies is not really relevant before 1923, but the results are hard to predict. Weimar likely survives without him, but still with a right wing coalition in charge. It might only be a republic in name with an oligarchy of industrialists, nobility, military, and monarchists that decide what is going to happen. There is a good possibility that Austria and Germany unite at some point, though the Sudeten and the Polish corridor are likely to remain out. I doubt the Soviets would attack west, as it would mean war with the united Europe. So the Soviet Union is most likely going to be alive and well today, thanks to remaining intact without the Nazi invasion and the destruction. Germany is likely to remain a leader in science without the exodus of intelligensia. It is also likely the economic engine of Europe. France recovers eventually from its decline after WW1, but is still the main rival of Germany.
There is likely no European Union without German and French detente; this may come about if the Soviets threaten Europe. Germany will rearm and be the shield of Europe. Poland and Germany will have to reach an accommodation eventually, as they need each other in the event of a Soviet attack-Germany to have the buffer zone and Poland for military support. The little entente would break down eventually, as Germany is seen to be the economic partner to have, especially as the 40's and 50's roll around. The US is not so economically dominant and the British and French have to deal with decolonization eventually. The Japanese are stuck in the quagmire of China forever, and won't risk going to war with an undistracted Europe/US. Though if they do, it will be over that much quicker and China will NOT go communist. Instead it will remain a corrupt kleptocracy and likely turn into our modern version of itself, but simply earlier and without the terrible and damaging cultural shift of the communist era. Germany may end up their chief sponsor without the Japanese alliance, and also then have special privileges in trading with them. This is bad for the French-British, as they will have this new axis to contend with, one that is going to get rich off one another and work together to open up new markets by helping go after the closed British-French colonies. This can get ugly if they are seen supplying nationalist movements in the colonies.
China eventually becomes the new Japan and likely sponsor of the decolonization movement in Asia. India might turn into a blood bath for the British, who are not going to have the support of the US. In fact the US and Britain may never develop their special relationship without WW2, which means that the US opposes imperialism that much more, as it locks them out of emerging markets. Britain has to go it alone and may find the US supporting the new countries trying to break from France and Britain. International relations are then strained between the British-French and the US, who may in turn look to Germany as an ally, because they also will want new markets.
Communism would of course stick its nose into everything, as Stalin is not going to have access to Europe. He will look elsewhere for new "markets".
The world would still be tri-polar, with the Communists, Imperialists, and free states all working against one another. Economics will be the major weapon, as I don't see any state capable of it wanting to start another world war.