19994975

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1$

素因数の和:105

約数の個数: 96

約数和(自身を含む): 35997696

約数和(自身を除く): 16002721

約数列:

[1, 5, 7, 11, 13, 17, 25, 35, 47, 55, 65, 77, 85, 91, 119, 143, 175, 187, 221, 235, 275, 325, 329, 385, 425, 455, 517, 595, 611, 715, 799, 935, 1001, 1105, 1175, 1309, 1547, 1645, 1925, 2275, 2431, 2585, 2975, 3055, 3575, 3619, 3995, 4277, 4675, 5005, 5525, 5593, 6545, 6721, 7735, 8225, 8789, 10387, 12155, 12925, 15275, 17017, 18095, 19975, 21385, 25025, 27965, 32725, 33605, 38675, 43945, 47047, 51935, 60775, 61523, 72709, 85085, 90475, 106925, 114257, 139825, 168025, 219725, 235235, 259675, 307615, 363545, 425425, 571285, 799799, 1176175, 1538075, 1817725, 2856425, 3998995, 19994975]

約数ペア:

[(1, 19994975), (5, 3998995), (7, 2856425), (11, 1817725), (13, 1538075), (17, 1176175), (25, 799799), (35, 571285), (47, 425425), (55, 363545), (65, 307615), (77, 259675), (85, 235235), (91, 219725), (119, 168025), (143, 139825), (175, 114257), (187, 106925), (221, 90475), (235, 85085), (275, 72709), (325, 61523), (329, 60775), (385, 51935), (425, 47047), (455, 43945), (517, 38675), (595, 33605), (611, 32725), (715, 27965), (799, 25025), (935, 21385), (1001, 19975), (1105, 18095), (1175, 17017), (1309, 15275), (1547, 12925), (1645, 12155), (1925, 10387), (2275, 8789), (2431, 8225), (2585, 7735), (2975, 6721), (3055, 6545), (3575, 5593), (3619, 5525), (3995, 5005), (4277, 4675)]