https://www.cpu-monkey.com/en/compare_cpu-intel_celeron_n402...
The N4020 is the model of Celeron used in the 2021 Dell Chromebook. I'm seeing N3060, 2955U, etc.
The Pentium Silver N5000, which isn't badged as a Celeron, is still much slower on multi-threaded and single-threaded perf: https://www.cpu-monkey.com/en/compare_cpu-intel_pentium_silv...
The entire Snapdragon 865 package cost manufacturers $150-$160. The Pentium Silver N5000 retails for $90-100. The 860 would presumably be even cheaper than the 865.