21008175

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{16477}}^1$

素因数の和:16507

約数の個数: 24

約数和(自身を含む): 36778896

約数和(自身を除く): 15770721

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275, 16477, 49431, 82385, 247155, 280109, 411925, 840327, 1235775, 1400545, 4201635, 7002725, 21008175]

約数ペア:

[(1, 21008175), (3, 7002725), (5, 4201635), (15, 1400545), (17, 1235775), (25, 840327), (51, 411925), (75, 280109), (85, 247155), (255, 82385), (425, 49431), (1275, 16477)]