21120020

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{55579}}^1$

素因数の和:55607

約数の個数: 24

約数和(自身を含む): 46687200

約数和(自身を除く): 25567180

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 55579, 111158, 222316, 277895, 555790, 1056001, 1111580, 2112002, 4224004, 5280005, 10560010, 21120020]

約数ペア:

[(1, 21120020), (2, 10560010), (4, 5280005), (5, 4224004), (10, 2112002), (19, 1111580), (20, 1056001), (38, 555790), (76, 277895), (95, 222316), (190, 111158), (380, 55579)]