divisor

US /dɪˈvaɪ.zɚ/
UK /dɪˈvaɪ.zɚ/
"divisor" picture
1.

a number that divides another number exactly, without leaving a remainder

:
In the equation 12 ÷ 3 = 4, 3 is the divisor.
The divisors of 10 are 1, 2, 5, and 10.