21216503

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{677}}^1$

素因数の和:743

約数の個数: 24

約数和(自身を含む): 27412896

約数和(自身を除く): 6196393

約数列:

[1, 7, 11, 37, 77, 121, 259, 407, 677, 847, 2849, 4477, 4739, 7447, 25049, 31339, 52129, 81917, 175343, 275539, 573419, 1928773, 3030929, 21216503]

約数ペア:

[(1, 21216503), (7, 3030929), (11, 1928773), (37, 573419), (77, 275539), (121, 175343), (259, 81917), (407, 52129), (677, 31339), (847, 25049), (2849, 7447), (4477, 4739)]