21399581

素因数分解:

$7^1\times {\mathrm{41}}^1\times {\mathrm{173}}^1\times {\mathrm{431}}^1$

素因数の和:652

約数の個数: 16

約数和(自身を含む): 25256448

約数和(自身を除く): 3856867

約数列:

[1, 7, 41, 173, 287, 431, 1211, 3017, 7093, 17671, 49651, 74563, 123697, 521941, 3057083, 21399581]

約数ペア:

[(1, 21399581), (7, 3057083), (41, 521941), (173, 123697), (287, 74563), (431, 49651), (1211, 17671), (3017, 7093)]