19985721

素因数分解:

$3^1\times 7^1\times {\mathrm{73}}^1\times {\mathrm{13037}}^1$

素因数の和:13120

約数の個数: 16

約数和(自身を含む): 30873984

約数和(自身を除く): 10888263

約数列:

[1, 3, 7, 21, 73, 219, 511, 1533, 13037, 39111, 91259, 273777, 951701, 2855103, 6661907, 19985721]

約数ペア:

[(1, 19985721), (3, 6661907), (7, 2855103), (21, 951701), (73, 273777), (219, 91259), (511, 39111), (1533, 13037)]