Coryphanthas can be difficult, as the spination changes with age, though your plant looks like a mature one.
I would suggest that it is either C. pallida or C. cornifera, and I favour the first, though your plant still has a few too few radial spines to fit the description fully. My reason is that C. pallida offsets quite readily, but C. cornifera usually stays solitary.
Flowers might help, if your plant has flowered.
But this is only my best guess, others might be able to help more.