21000105

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{409}}^1$

素因数の和:590

約数の個数: 48

約数和(自身を含む): 41957760

約数和(自身を除く): 20957655

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 163, 315, 409, 489, 815, 1141, 1227, 1467, 2045, 2445, 2863, 3423, 3681, 5705, 6135, 7335, 8589, 10269, 14315, 17115, 18405, 25767, 42945, 51345, 66667, 128835, 200001, 333335, 466669, 600003, 1000005, 1400007, 2333345, 3000015, 4200021, 7000035, 21000105]

約数ペア:

[(1, 21000105), (3, 7000035), (5, 4200021), (7, 3000015), (9, 2333345), (15, 1400007), (21, 1000005), (35, 600003), (45, 466669), (63, 333335), (105, 200001), (163, 128835), (315, 66667), (409, 51345), (489, 42945), (815, 25767), (1141, 18405), (1227, 17115), (1467, 14315), (2045, 10269), (2445, 8589), (2863, 7335), (3423, 6135), (3681, 5705)]