RTAC86U Power Supply Question

I have a quick question about the power supply for the RT-AC86U. On the Asus Website, the power supply specs are listed as;

AC Input : 110V~240V(50~60Hz)
DC Output : 19 V with max. 1.75 A current
DC Output : 12 V with max. 3 A current

I have a couple of 20Vdc, 4A supplies. Has anyone used the 86U at 20Vdc? I suspect that it should not matter, but I do want to make sure.

I'd like to try a larger size supply to see if it makes any difference in the famous router hang on reboot. I have...

RTAC86U Power Supply Question