21508880

素因数分解:

$2^4\times 5^1\times {\mathrm{268861}}^1$

素因数の和:268874

約数の個数: 20

約数和(自身を含む): 50008332

約数和(自身を除く): 28499452

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268861, 537722, 1075444, 1344305, 2150888, 2688610, 4301776, 5377220, 10754440, 21508880]

約数ペア:

[(1, 21508880), (2, 10754440), (4, 5377220), (5, 4301776), (8, 2688610), (10, 2150888), (16, 1344305), (20, 1075444), (40, 537722), (80, 268861)]