20640220

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25171}}^1$

素因数の和:25221

約数の個数: 24

約数和(自身を含む): 44403408

約数和(自身を除く): 23763188

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25171, 50342, 100684, 125855, 251710, 503420, 1032011, 2064022, 4128044, 5160055, 10320110, 20640220]

約数ペア:

[(1, 20640220), (2, 10320110), (4, 5160055), (5, 4128044), (10, 2064022), (20, 1032011), (41, 503420), (82, 251710), (164, 125855), (205, 100684), (410, 50342), (820, 25171)]