21007880

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{5099}}^1$

素因数の和:5213

約数の個数: 32

約数和(自身を含む): 47736000

約数和(自身を除く): 26728120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 5099, 10198, 20396, 25495, 40792, 50990, 101980, 203960, 525197, 1050394, 2100788, 2625985, 4201576, 5251970, 10503940, 21007880]

約数ペア:

[(1, 21007880), (2, 10503940), (4, 5251970), (5, 4201576), (8, 2625985), (10, 2100788), (20, 1050394), (40, 525197), (103, 203960), (206, 101980), (412, 50990), (515, 40792), (824, 25495), (1030, 20396), (2060, 10198), (4120, 5099)]