21216280

素因数分解:

$2^3\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2777}}^1$

素因数の和:2979

約数の個数: 32

約数和(自身を含む): 48003840

約数和(自身を除く): 26787560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 191, 382, 764, 955, 1528, 1910, 2777, 3820, 5554, 7640, 11108, 13885, 22216, 27770, 55540, 111080, 530407, 1060814, 2121628, 2652035, 4243256, 5304070, 10608140, 21216280]

約数ペア:

[(1, 21216280), (2, 10608140), (4, 5304070), (5, 4243256), (8, 2652035), (10, 2121628), (20, 1060814), (40, 530407), (191, 111080), (382, 55540), (764, 27770), (955, 22216), (1528, 13885), (1910, 11108), (2777, 7640), (3820, 5554)]