9999980

素因数分解:

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

素因数の和:294

約数の個数: 36

約数和(自身を含む): 21849408

約数和(自身を除く): 11849428

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 127, 155, 254, 310, 508, 620, 635, 1270, 2540, 3937, 7874, 15748, 16129, 19685, 32258, 39370, 64516, 78740, 80645, 161290, 322580, 499999, 999998, 1999996, 2499995, 4999990, 9999980]

約数ペア:

[(1, 9999980), (2, 4999990), (4, 2499995), (5, 1999996), (10, 999998), (20, 499999), (31, 322580), (62, 161290), (124, 80645), (127, 78740), (155, 64516), (254, 39370), (310, 32258), (508, 19685), (620, 16129), (635, 15748), (1270, 7874), (2540, 3937)]