20101905

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{461}}^1$

素因数の和:511

約数の個数: 64

約数和(自身を含む): 39916800

約数和(自身を除く): 19814895

約数列:

[1, 3, 5, 9, 15, 17, 19, 27, 45, 51, 57, 85, 95, 135, 153, 171, 255, 285, 323, 459, 461, 513, 765, 855, 969, 1383, 1615, 2295, 2305, 2565, 2907, 4149, 4845, 6915, 7837, 8721, 8759, 12447, 14535, 20745, 23511, 26277, 39185, 43605, 43795, 62235, 70533, 78831, 117555, 131385, 148903, 211599, 236493, 352665, 394155, 446709, 744515, 1057995, 1182465, 1340127, 2233545, 4020381, 6700635, 20101905]

約数ペア:

[(1, 20101905), (3, 6700635), (5, 4020381), (9, 2233545), (15, 1340127), (17, 1182465), (19, 1057995), (27, 744515), (45, 446709), (51, 394155), (57, 352665), (85, 236493), (95, 211599), (135, 148903), (153, 131385), (171, 117555), (255, 78831), (285, 70533), (323, 62235), (459, 43795), (461, 43605), (513, 39185), (765, 26277), (855, 23511), (969, 20745), (1383, 14535), (1615, 12447), (2295, 8759), (2305, 8721), (2565, 7837), (2907, 6915), (4149, 4845)]