21203920

素因数分解:

$2^4\times 5^1\times {\mathrm{127}}^1\times {\mathrm{2087}}^1$

素因数の和:2227

約数の個数: 40

約数和(自身を含む): 49711104

約数和(自身を除く): 28507184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 127, 254, 508, 635, 1016, 1270, 2032, 2087, 2540, 4174, 5080, 8348, 10160, 10435, 16696, 20870, 33392, 41740, 83480, 166960, 265049, 530098, 1060196, 1325245, 2120392, 2650490, 4240784, 5300980, 10601960, 21203920]

約数ペア:

[(1, 21203920), (2, 10601960), (4, 5300980), (5, 4240784), (8, 2650490), (10, 2120392), (16, 1325245), (20, 1060196), (40, 530098), (80, 265049), (127, 166960), (254, 83480), (508, 41740), (635, 33392), (1016, 20870), (1270, 16696), (2032, 10435), (2087, 10160), (2540, 8348), (4174, 5080)]