19990390

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{353}}^1\times {\mathrm{809}}^1$

素因数の和:1176

約数の個数: 32

約数和(自身を含む): 41290560

約数和(自身を除く): 21300170

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 353, 706, 809, 1618, 1765, 2471, 3530, 4045, 4942, 5663, 8090, 11326, 12355, 24710, 28315, 56630, 285577, 571154, 1427885, 1999039, 2855770, 3998078, 9995195, 19990390]

約数ペア:

[(1, 19990390), (2, 9995195), (5, 3998078), (7, 2855770), (10, 1999039), (14, 1427885), (35, 571154), (70, 285577), (353, 56630), (706, 28315), (809, 24710), (1618, 12355), (1765, 11326), (2471, 8090), (3530, 5663), (4045, 4942)]