20878220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{2207}}^1$

素因数の和:2270

約数の個数: 48

約数和(自身を含む): 48964608

約数和(自身を除く): 28086388

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 172, 215, 220, 430, 473, 860, 946, 1892, 2207, 2365, 4414, 4730, 8828, 9460, 11035, 22070, 24277, 44140, 48554, 94901, 97108, 121385, 189802, 242770, 379604, 474505, 485540, 949010, 1043911, 1898020, 2087822, 4175644, 5219555, 10439110, 20878220]

約数ペア:

[(1, 20878220), (2, 10439110), (4, 5219555), (5, 4175644), (10, 2087822), (11, 1898020), (20, 1043911), (22, 949010), (43, 485540), (44, 474505), (55, 379604), (86, 242770), (110, 189802), (172, 121385), (215, 97108), (220, 94901), (430, 48554), (473, 44140), (860, 24277), (946, 22070), (1892, 11035), (2207, 9460), (2365, 8828), (4414, 4730)]