20421675

素因数分解:

$3^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{281}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 40912560

約数和(自身を除く): 20490885

約数列:

[1, 3, 5, 9, 15, 17, 19, 25, 45, 51, 57, 75, 85, 95, 153, 171, 225, 255, 281, 285, 323, 425, 475, 765, 843, 855, 969, 1275, 1405, 1425, 1615, 2529, 2907, 3825, 4215, 4275, 4777, 4845, 5339, 7025, 8075, 12645, 14331, 14535, 16017, 21075, 23885, 24225, 26695, 42993, 48051, 63225, 71655, 72675, 80085, 90763, 119425, 133475, 214965, 240255, 272289, 358275, 400425, 453815, 816867, 1074825, 1201275, 1361445, 2269075, 4084335, 6807225, 20421675]

約数ペア:

[(1, 20421675), (3, 6807225), (5, 4084335), (9, 2269075), (15, 1361445), (17, 1201275), (19, 1074825), (25, 816867), (45, 453815), (51, 400425), (57, 358275), (75, 272289), (85, 240255), (95, 214965), (153, 133475), (171, 119425), (225, 90763), (255, 80085), (281, 72675), (285, 71655), (323, 63225), (425, 48051), (475, 42993), (765, 26695), (843, 24225), (855, 23885), (969, 21075), (1275, 16017), (1405, 14535), (1425, 14331), (1615, 12645), (2529, 8075), (2907, 7025), (3825, 5339), (4215, 4845), (4275, 4777)]