21309940

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{349}}^1$

素因数の和:472

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25259660

約数列:

[1, 2, 4, 5, 10, 20, 43, 71, 86, 142, 172, 215, 284, 349, 355, 430, 698, 710, 860, 1396, 1420, 1745, 3053, 3490, 6106, 6980, 12212, 15007, 15265, 24779, 30014, 30530, 49558, 60028, 61060, 75035, 99116, 123895, 150070, 247790, 300140, 495580, 1065497, 2130994, 4261988, 5327485, 10654970, 21309940]

約数ペア:

[(1, 21309940), (2, 10654970), (4, 5327485), (5, 4261988), (10, 2130994), (20, 1065497), (43, 495580), (71, 300140), (86, 247790), (142, 150070), (172, 123895), (215, 99116), (284, 75035), (349, 61060), (355, 60028), (430, 49558), (698, 30530), (710, 30014), (860, 24779), (1396, 15265), (1420, 15007), (1745, 12212), (3053, 6980), (3490, 6106)]