Was doing some digging on daedric princes and their artifacts. Heres my results

Azura: 6 (7 if we include the skeleton key)

Boethia: 4 (owns 5 but 1 was destroyed)

Clavicus Vile: 5 (6, but it may not exist in reality)

Hermaeus Mora: 10+

Hircine: 16

Ithelia: 4

Jyggalag: 1

Malacath: 5+ (6+ if we include the saviors hide)

Mehrunes Dagon: 12+ (13+ if we include the spear of bitter mircy)

Mephala: 33

Meridia: 11+ (12+ if we include the ring of khajiit)

Molag Bal: 13+

Namira: 4

Nocturnal: 6

Peryite: 6 (7 if alternate timelines allowed)

Sanguine: 3 (30 if we also include theads of the webspinner)

Sheogorath: 9 (36 if we also include the threads of the webspinner) [10 if we believe sheogorath was the creator of umbra] {10 if we include the staff of the everscamp}

Vaermina: 3

Please inform me if im wrong or not