279999440

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{127}}^2$

素因数の和:305

約数の個数: 120

約数和(自身を含む): 774093312

約数和(自身を除く): 494093872

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 31, 35, 40, 56, 62, 70, 80, 112, 124, 127, 140, 155, 217, 248, 254, 280, 310, 434, 496, 508, 560, 620, 635, 868, 889, 1016, 1085, 1240, 1270, 1736, 1778, 2032, 2170, 2480, 2540, 3472, 3556, 3937, 4340, 4445, 5080, 7112, 7874, 8680, 8890, 10160, 14224, 15748, 16129, 17360, 17780, 19685, 27559, 31496, 32258, 35560, 39370, 55118, 62992, 64516, 71120, 78740, 80645, 110236, 112903, 129032, 137795, 157480, 161290, 220472, 225806, 258064, 275590, 314960, 322580, 440944, 451612, 499999, 551180, 564515, 645160, 903224, 999998, 1102360, 1129030, 1290320, 1806448, 1999996, 2204720, 2258060, 2499995, 3499993, 3999992, 4516120, 4999990, 6999986, 7999984, 9032240, 9999980, 13999972, 17499965, 19999960, 27999944, 34999930, 39999920, 55999888, 69999860, 139999720, 279999440]

約数ペア:

[(1, 279999440), (2, 139999720), (4, 69999860), (5, 55999888), (7, 39999920), (8, 34999930), (10, 27999944), (14, 19999960), (16, 17499965), (20, 13999972), (28, 9999980), (31, 9032240), (35, 7999984), (40, 6999986), (56, 4999990), (62, 4516120), (70, 3999992), (80, 3499993), (112, 2499995), (124, 2258060), (127, 2204720), (140, 1999996), (155, 1806448), (217, 1290320), (248, 1129030), (254, 1102360), (280, 999998), (310, 903224), (434, 645160), (496, 564515), (508, 551180), (560, 499999), (620, 451612), (635, 440944), (868, 322580), (889, 314960), (1016, 275590), (1085, 258064), (1240, 225806), (1270, 220472), (1736, 161290), (1778, 157480), (2032, 137795), (2170, 129032), (2480, 112903), (2540, 110236), (3472, 80645), (3556, 78740), (3937, 71120), (4340, 64516), (4445, 62992), (5080, 55118), (7112, 39370), (7874, 35560), (8680, 32258), (8890, 31496), (10160, 27559), (14224, 19685), (15748, 17780), (16129, 17360)]