21258321

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53279}}^1$

素因数の和:53308

約数の個数: 16

約数和(自身を含む): 34099200

約数和(自身を除く): 12840879

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53279, 159837, 372953, 1012301, 1118859, 3036903, 7086107, 21258321]

約数ペア:

[(1, 21258321), (3, 7086107), (7, 3036903), (19, 1118859), (21, 1012301), (57, 372953), (133, 159837), (399, 53279)]