21188825

素因数分解:

$5^2\times 7^4\times {\mathrm{353}}^1$

素因数の和:391

約数の個数: 30

約数和(自身を含む): 30738174

約数和(自身を除く): 9549349

約数列:

[1, 5, 7, 25, 35, 49, 175, 245, 343, 353, 1225, 1715, 1765, 2401, 2471, 8575, 8825, 12005, 12355, 17297, 60025, 61775, 86485, 121079, 432425, 605395, 847553, 3026975, 4237765, 21188825]

約数ペア:

[(1, 21188825), (5, 4237765), (7, 3026975), (25, 847553), (35, 605395), (49, 432425), (175, 121079), (245, 86485), (343, 61775), (353, 60025), (1225, 17297), (1715, 12355), (1765, 12005), (2401, 8825), (2471, 8575)]