[질문] 예압

20약수:1,2,4,5,10,20/21의약수:1,3,7,21/22의약수:1,2,11,22/23의약수:1,23/24의약수:1,2,3,4,6,8,12,24/25의약수:1,5,25/26의약수:1,2,13,26/27약수:1,3,9,27