21309075

素因数分解:

$3^4\times 5^2\times {\mathrm{17}}^1\times {\mathrm{619}}^1$

素因数の和:658

約数の個数: 60

約数和(自身を含む): 41861160

約数和(自身を除く): 20552085

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 45, 51, 75, 81, 85, 135, 153, 225, 255, 405, 425, 459, 619, 675, 765, 1275, 1377, 1857, 2025, 2295, 3095, 3825, 5571, 6885, 9285, 10523, 11475, 15475, 16713, 27855, 31569, 34425, 46425, 50139, 52615, 83565, 94707, 139275, 157845, 250695, 263075, 284121, 417825, 473535, 789225, 852363, 1253475, 1420605, 2367675, 4261815, 7103025, 21309075]

約数ペア:

[(1, 21309075), (3, 7103025), (5, 4261815), (9, 2367675), (15, 1420605), (17, 1253475), (25, 852363), (27, 789225), (45, 473535), (51, 417825), (75, 284121), (81, 263075), (85, 250695), (135, 157845), (153, 139275), (225, 94707), (255, 83565), (405, 52615), (425, 50139), (459, 46425), (619, 34425), (675, 31569), (765, 27855), (1275, 16713), (1377, 15475), (1857, 11475), (2025, 10523), (2295, 9285), (3095, 6885), (3825, 5571)]