21578221

素因数分解:

$7^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1\times {\mathrm{331}}^1$

素因数の和:544

約数の個数: 16

約数和(自身を含む): 25285120

約数和(自身を除く): 3706899

約数列:

[1, 7, 67, 139, 331, 469, 973, 2317, 9313, 22177, 46009, 65191, 155239, 322063, 3082603, 21578221]

約数ペア:

[(1, 21578221), (7, 3082603), (67, 322063), (139, 155239), (331, 65191), (469, 46009), (973, 22177), (2317, 9313)]