21256880

素因数分解:

$2^4\times 5^1\times {\mathrm{265711}}^1$

素因数の和:265724

約数の個数: 20

約数和(自身を含む): 49422432

約数和(自身を除く): 28165552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265711, 531422, 1062844, 1328555, 2125688, 2657110, 4251376, 5314220, 10628440, 21256880]

約数ペア:

[(1, 21256880), (2, 10628440), (4, 5314220), (5, 4251376), (8, 2657110), (10, 2125688), (16, 1328555), (20, 1062844), (40, 531422), (80, 265711)]