12720140

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{4051}}^1$

素因数の和:4217

約数の個数: 24

約数和(自身を含む): 26889072

約数和(自身を除く): 14168932

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 4051, 8102, 16204, 20255, 40510, 81020, 636007, 1272014, 2544028, 3180035, 6360070, 12720140]

約数ペア:

[(1, 12720140), (2, 6360070), (4, 3180035), (5, 2544028), (10, 1272014), (20, 636007), (157, 81020), (314, 40510), (628, 20255), (785, 16204), (1570, 8102), (3140, 4051)]