18678985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1$

素因数の和:265

約数の個数: 32

約数和(自身を含む): 25458048

約数和(自身を除く): 6779063

約数列:

[1, 5, 13, 41, 43, 65, 163, 205, 215, 533, 559, 815, 1763, 2119, 2665, 2795, 6683, 7009, 8815, 10595, 22919, 33415, 35045, 86879, 91117, 114595, 287369, 434395, 455585, 1436845, 3735797, 18678985]

約数ペア:

[(1, 18678985), (5, 3735797), (13, 1436845), (41, 455585), (43, 434395), (65, 287369), (163, 114595), (205, 91117), (215, 86879), (533, 35045), (559, 33415), (815, 22919), (1763, 10595), (2119, 8815), (2665, 7009), (2795, 6683)]