20718940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{2297}}^1$

素因数の和:2358

約数の個数: 48

約数和(自身を含む): 48644064

約数和(自身を除く): 27925124

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 41, 44, 55, 82, 110, 164, 205, 220, 410, 451, 820, 902, 1804, 2255, 2297, 4510, 4594, 9020, 9188, 11485, 22970, 25267, 45940, 50534, 94177, 101068, 126335, 188354, 252670, 376708, 470885, 505340, 941770, 1035947, 1883540, 2071894, 4143788, 5179735, 10359470, 20718940]

約数ペア:

[(1, 20718940), (2, 10359470), (4, 5179735), (5, 4143788), (10, 2071894), (11, 1883540), (20, 1035947), (22, 941770), (41, 505340), (44, 470885), (55, 376708), (82, 252670), (110, 188354), (164, 126335), (205, 101068), (220, 94177), (410, 50534), (451, 45940), (820, 25267), (902, 22970), (1804, 11485), (2255, 9188), (2297, 9020), (4510, 4594)]