19810945

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{7351}}^1$

素因数の和:7381

約数の個数: 24

約数和(自身を含む): 30172608

約数和(自身を除く): 10361663

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 245, 385, 539, 2695, 7351, 36755, 51457, 80861, 257285, 360199, 404305, 566027, 1800995, 2830135, 3962189, 19810945]

約数ペア:

[(1, 19810945), (5, 3962189), (7, 2830135), (11, 1800995), (35, 566027), (49, 404305), (55, 360199), (77, 257285), (245, 80861), (385, 51457), (539, 36755), (2695, 7351)]