21481725

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{6661}}^1$

素因数の和:6717

約数の個数: 24

約数和(自身を含む): 36347872

約数和(自身を除く): 14866147

約数列:

[1, 3, 5, 15, 25, 43, 75, 129, 215, 645, 1075, 3225, 6661, 19983, 33305, 99915, 166525, 286423, 499575, 859269, 1432115, 4296345, 7160575, 21481725]

約数ペア:

[(1, 21481725), (3, 7160575), (5, 4296345), (15, 1432115), (25, 859269), (43, 499575), (75, 286423), (129, 166525), (215, 99915), (645, 33305), (1075, 19983), (3225, 6661)]