21745100

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{389}}^1$

素因数の和:459

約数の個数: 72

約数和(自身を含む): 52132080

約数和(自身を除く): 30386980

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 43, 50, 52, 65, 86, 100, 130, 172, 215, 260, 325, 389, 430, 559, 650, 778, 860, 1075, 1118, 1300, 1556, 1945, 2150, 2236, 2795, 3890, 4300, 5057, 5590, 7780, 9725, 10114, 11180, 13975, 16727, 19450, 20228, 25285, 27950, 33454, 38900, 50570, 55900, 66908, 83635, 101140, 126425, 167270, 217451, 252850, 334540, 418175, 434902, 505700, 836350, 869804, 1087255, 1672700, 2174510, 4349020, 5436275, 10872550, 21745100]

約数ペア:

[(1, 21745100), (2, 10872550), (4, 5436275), (5, 4349020), (10, 2174510), (13, 1672700), (20, 1087255), (25, 869804), (26, 836350), (43, 505700), (50, 434902), (52, 418175), (65, 334540), (86, 252850), (100, 217451), (130, 167270), (172, 126425), (215, 101140), (260, 83635), (325, 66908), (389, 55900), (430, 50570), (559, 38900), (650, 33454), (778, 27950), (860, 25285), (1075, 20228), (1118, 19450), (1300, 16727), (1556, 13975), (1945, 11180), (2150, 10114), (2236, 9725), (2795, 7780), (3890, 5590), (4300, 5057)]