21218805

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{27737}}^1$

素因数の和:27765

約数の個数: 24

約数和(自身を含む): 38944152

約数和(自身を除く): 17725347

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 27737, 83211, 138685, 249633, 416055, 471529, 1248165, 1414587, 2357645, 4243761, 7072935, 21218805]

約数ペア:

[(1, 21218805), (3, 7072935), (5, 4243761), (9, 2357645), (15, 1414587), (17, 1248165), (45, 471529), (51, 416055), (85, 249633), (153, 138685), (255, 83211), (765, 27737)]