21147705

素因数分解:

$3^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6619}}^1$

素因数の和:6701

約数の個数: 24

約数和(自身を含む): 37177920

約数和(自身を除く): 16030215

約数列:

[1, 3, 5, 9, 15, 45, 71, 213, 355, 639, 1065, 3195, 6619, 19857, 33095, 59571, 99285, 297855, 469949, 1409847, 2349745, 4229541, 7049235, 21147705]

約数ペア:

[(1, 21147705), (3, 7049235), (5, 4229541), (9, 2349745), (15, 1409847), (45, 469949), (71, 297855), (213, 99285), (355, 59571), (639, 33095), (1065, 19857), (3195, 6619)]