19988997

素因数分解:

$3^1\times 7^1\times {\mathrm{571}}^1\times {\mathrm{1667}}^1$

素因数の和:2248

約数の個数: 16

約数和(自身を含む): 30531072

約数和(自身を除く): 10542075

約数列:

[1, 3, 7, 21, 571, 1667, 1713, 3997, 5001, 11669, 11991, 35007, 951857, 2855571, 6662999, 19988997]

約数ペア:

[(1, 19988997), (3, 6662999), (7, 2855571), (21, 951857), (571, 35007), (1667, 11991), (1713, 11669), (3997, 5001)]