21003280

素因数分解:

$2^4\times 5^1\times {\mathrm{262541}}^1$

素因数の和:262554

約数の個数: 20

約数和(自身を含む): 48832812

約数和(自身を除く): 27829532

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262541, 525082, 1050164, 1312705, 2100328, 2625410, 4200656, 5250820, 10501640, 21003280]

約数ペア:

[(1, 21003280), (2, 10501640), (4, 5250820), (5, 4200656), (8, 2625410), (10, 2100328), (16, 1312705), (20, 1050164), (40, 525082), (80, 262541)]