21207280

素因数分解:

$2^4\times 5^1\times {\mathrm{265091}}^1$

素因数の和:265104

約数の個数: 20

約数和(自身を含む): 49307112

約数和(自身を除く): 28099832

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265091, 530182, 1060364, 1325455, 2120728, 2650910, 4241456, 5301820, 10603640, 21207280]

約数ペア:

[(1, 21207280), (2, 10603640), (4, 5301820), (5, 4241456), (8, 2650910), (10, 2120728), (16, 1325455), (20, 1060364), (40, 530182), (80, 265091)]