And I just understood why that’s the case. Most of the old units used highly composite numbers as factors, which have an incredibly high number of divisors. We still widely use such factors for time and angles.

• 4: 1, 2, 4
• 5: 1, 5
• 6: 1, 2, 3, 6
• 10: 1, 2, 5, 10
• 12: 1, 2, 3, 4, 6, 12
• 20: 1, 2, 4, 5, 10, 20
• 24: 1, 2, 3, 4, 6, 8, 12, 24
• 50: 1, 2, 5, 10, 25, 50
• 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
• 100: 1, 2, 4, 5, 10, 20, 25, 50, 100
• 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
• 360: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 360
• 840: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
• 1000: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000