19943720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{211}}^1$

素因数の和:378

約数の個数: 64

約数和(自身を含む): 48081600

約数和(自身を除く): 28137880

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 139, 170, 211, 278, 340, 422, 556, 680, 695, 844, 1055, 1112, 1390, 1688, 2110, 2363, 2780, 3587, 4220, 4726, 5560, 7174, 8440, 9452, 11815, 14348, 17935, 18904, 23630, 28696, 29329, 35870, 47260, 58658, 71740, 94520, 117316, 143480, 146645, 234632, 293290, 498593, 586580, 997186, 1173160, 1994372, 2492965, 3988744, 4985930, 9971860, 19943720]

約数ペア:

[(1, 19943720), (2, 9971860), (4, 4985930), (5, 3988744), (8, 2492965), (10, 1994372), (17, 1173160), (20, 997186), (34, 586580), (40, 498593), (68, 293290), (85, 234632), (136, 146645), (139, 143480), (170, 117316), (211, 94520), (278, 71740), (340, 58658), (422, 47260), (556, 35870), (680, 29329), (695, 28696), (844, 23630), (1055, 18904), (1112, 17935), (1390, 14348), (1688, 11815), (2110, 9452), (2363, 8440), (2780, 7174), (3587, 5560), (4220, 4726)]