随机数

• 阝(earthen mound; village; hamlet)RADICAL
• 迶(follow; accompany (in sound))PHONETIC

Following someone else through villages and neighborhoods is the meaning of the character 随.

• 娄(many times; piled up)PHONO-SEMANTIC
• 攵(tap; hand motion)RADICAL

Counting numbers is using your hand to tap repeatedly many times in order to calculate.