21365225

素因数分解:

$5^2\times 7^2\times {\mathrm{107}}^1\times {\mathrm{163}}^1$

素因数の和:294

約数の個数: 36

約数和(自身を含む): 31297104

約数和(自身を除く): 9931879

約数列:

[1, 5, 7, 25, 35, 49, 107, 163, 175, 245, 535, 749, 815, 1141, 1225, 2675, 3745, 4075, 5243, 5705, 7987, 17441, 18725, 26215, 28525, 39935, 87205, 122087, 131075, 199675, 436025, 610435, 854609, 3052175, 4273045, 21365225]

約数ペア:

[(1, 21365225), (5, 4273045), (7, 3052175), (25, 854609), (35, 610435), (49, 436025), (107, 199675), (163, 131075), (175, 122087), (245, 87205), (535, 39935), (749, 28525), (815, 26215), (1141, 18725), (1225, 17441), (2675, 7987), (3745, 5705), (4075, 5243)]