21390015

素因数分解:

$3^1\times 5^1\times {\mathrm{139}}^1\times {\mathrm{10259}}^1$

素因数の和:10406

約数の個数: 16

約数和(自身を含む): 34473600

約数和(自身を除く): 13083585

約数列:

[1, 3, 5, 15, 139, 417, 695, 2085, 10259, 30777, 51295, 153885, 1426001, 4278003, 7130005, 21390015]

約数ペア:

[(1, 21390015), (3, 7130005), (5, 4278003), (15, 1426001), (139, 153885), (417, 51295), (695, 30777), (2085, 10259)]