18979720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:286

約数の個数: 64

約数和(自身を含む): 44634240

約数和(自身を除く): 25654520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 71, 82, 142, 163, 164, 205, 284, 326, 328, 355, 410, 568, 652, 710, 815, 820, 1304, 1420, 1630, 1640, 2840, 2911, 3260, 5822, 6520, 6683, 11573, 11644, 13366, 14555, 23146, 23288, 26732, 29110, 33415, 46292, 53464, 57865, 58220, 66830, 92584, 115730, 116440, 133660, 231460, 267320, 462920, 474493, 948986, 1897972, 2372465, 3795944, 4744930, 9489860, 18979720]

約数ペア:

[(1, 18979720), (2, 9489860), (4, 4744930), (5, 3795944), (8, 2372465), (10, 1897972), (20, 948986), (40, 474493), (41, 462920), (71, 267320), (82, 231460), (142, 133660), (163, 116440), (164, 115730), (205, 92584), (284, 66830), (326, 58220), (328, 57865), (355, 53464), (410, 46292), (568, 33415), (652, 29110), (710, 26732), (815, 23288), (820, 23146), (1304, 14555), (1420, 13366), (1630, 11644), (1640, 11573), (2840, 6683), (2911, 6520), (3260, 5822)]