19999960

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{127}}^2$

素因数の和:296

約数の個数: 48

約数和(自身を含む): 46820160

約数和(自身を除く): 26820200

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 127, 155, 248, 254, 310, 508, 620, 635, 1016, 1240, 1270, 2540, 3937, 5080, 7874, 15748, 16129, 19685, 31496, 32258, 39370, 64516, 78740, 80645, 129032, 157480, 161290, 322580, 499999, 645160, 999998, 1999996, 2499995, 3999992, 4999990, 9999980, 19999960]

約数ペア:

[(1, 19999960), (2, 9999980), (4, 4999990), (5, 3999992), (8, 2499995), (10, 1999996), (20, 999998), (31, 645160), (40, 499999), (62, 322580), (124, 161290), (127, 157480), (155, 129032), (248, 80645), (254, 78740), (310, 64516), (508, 39370), (620, 32258), (635, 31496), (1016, 19685), (1240, 16129), (1270, 15748), (2540, 7874), (3937, 5080)]