21125615

素因数分解:

$5^1\times 7^2\times {\mathrm{23}}^2\times {\mathrm{163}}^1$

素因数の和:228

約数の個数: 36

約数和(自身を含む): 31016664

約数和(自身を除く): 9891049

約数列:

[1, 5, 7, 23, 35, 49, 115, 161, 163, 245, 529, 805, 815, 1127, 1141, 2645, 3703, 3749, 5635, 5705, 7987, 18515, 18745, 25921, 26243, 39935, 86227, 129605, 131215, 183701, 431135, 603589, 918505, 3017945, 4225123, 21125615]

約数ペア:

[(1, 21125615), (5, 4225123), (7, 3017945), (23, 918505), (35, 603589), (49, 431135), (115, 183701), (161, 131215), (163, 129605), (245, 86227), (529, 39935), (805, 26243), (815, 25921), (1127, 18745), (1141, 18515), (2645, 7987), (3703, 5705), (3749, 5635)]