20857725

素因数分解:

$3^2\times 5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1$

素因数の和:100

約数の個数: 144

約数和(自身を含む): 48746880

約数和(自身を除く): 27889155

約数列:

[1, 3, 5, 7, 9, 15, 17, 19, 21, 25, 35, 41, 45, 51, 57, 63, 75, 85, 95, 105, 119, 123, 133, 153, 171, 175, 205, 225, 255, 285, 287, 315, 323, 357, 369, 399, 425, 475, 525, 595, 615, 665, 697, 765, 779, 855, 861, 969, 1025, 1071, 1197, 1275, 1425, 1435, 1575, 1615, 1785, 1845, 1995, 2091, 2261, 2337, 2583, 2907, 2975, 3075, 3325, 3485, 3825, 3895, 4275, 4305, 4845, 4879, 5355, 5453, 5985, 6273, 6783, 7011, 7175, 8075, 8925, 9225, 9975, 10455, 11305, 11685, 12915, 13243, 14535, 14637, 16359, 17425, 19475, 20349, 21525, 24225, 24395, 26775, 27265, 29925, 31365, 33915, 35055, 39729, 43911, 49077, 52275, 56525, 58425, 64575, 66215, 72675, 73185, 81795, 92701, 101745, 119187, 121975, 136325, 156825, 169575, 175275, 198645, 219555, 245385, 278103, 331075, 365925, 408975, 463505, 508725, 595935, 834309, 993225, 1097775, 1226925, 1390515, 2317525, 2979675, 4171545, 6952575, 20857725]

約数ペア:

[(1, 20857725), (3, 6952575), (5, 4171545), (7, 2979675), (9, 2317525), (15, 1390515), (17, 1226925), (19, 1097775), (21, 993225), (25, 834309), (35, 595935), (41, 508725), (45, 463505), (51, 408975), (57, 365925), (63, 331075), (75, 278103), (85, 245385), (95, 219555), (105, 198645), (119, 175275), (123, 169575), (133, 156825), (153, 136325), (171, 121975), (175, 119187), (205, 101745), (225, 92701), (255, 81795), (285, 73185), (287, 72675), (315, 66215), (323, 64575), (357, 58425), (369, 56525), (399, 52275), (425, 49077), (475, 43911), (525, 39729), (595, 35055), (615, 33915), (665, 31365), (697, 29925), (765, 27265), (779, 26775), (855, 24395), (861, 24225), (969, 21525), (1025, 20349), (1071, 19475), (1197, 17425), (1275, 16359), (1425, 14637), (1435, 14535), (1575, 13243), (1615, 12915), (1785, 11685), (1845, 11305), (1995, 10455), (2091, 9975), (2261, 9225), (2337, 8925), (2583, 8075), (2907, 7175), (2975, 7011), (3075, 6783), (3325, 6273), (3485, 5985), (3825, 5453), (3895, 5355), (4275, 4879), (4305, 4845)]