208500020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{359}}^1\times {\mathrm{409}}^1$

素因数の和:848

約数の個数: 48

約数和(自身を含む): 446342400

約数和(自身を除く): 237842380

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 359, 409, 710, 718, 818, 1420, 1436, 1636, 1795, 2045, 3590, 4090, 7180, 8180, 25489, 29039, 50978, 58078, 101956, 116156, 127445, 145195, 146831, 254890, 290390, 293662, 509780, 580780, 587324, 734155, 1468310, 2936620, 10425001, 20850002, 41700004, 52125005, 104250010, 208500020]

約数ペア:

[(1, 208500020), (2, 104250010), (4, 52125005), (5, 41700004), (10, 20850002), (20, 10425001), (71, 2936620), (142, 1468310), (284, 734155), (355, 587324), (359, 580780), (409, 509780), (710, 293662), (718, 290390), (818, 254890), (1420, 146831), (1436, 145195), (1636, 127445), (1795, 116156), (2045, 101956), (3590, 58078), (4090, 50978), (7180, 29039), (8180, 25489)]