21387445

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{19}}^2\times {\mathrm{41}}^1$

素因数の和:118

約数の個数: 36

約数和(自身を含む): 29475684

約数和(自身を除く): 8088239

約数列:

[1, 5, 17, 19, 41, 85, 95, 205, 289, 323, 361, 697, 779, 1445, 1615, 1805, 3485, 3895, 5491, 6137, 11849, 13243, 14801, 27455, 30685, 59245, 66215, 74005, 104329, 225131, 251617, 521645, 1125655, 1258085, 4277489, 21387445]

約数ペア:

[(1, 21387445), (5, 4277489), (17, 1258085), (19, 1125655), (41, 521645), (85, 251617), (95, 225131), (205, 104329), (289, 74005), (323, 66215), (361, 59245), (697, 30685), (779, 27455), (1445, 14801), (1615, 13243), (1805, 11849), (3485, 6137), (3895, 5491)]