20525540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{271}}^1\times {\mathrm{541}}^1$

素因数の和:828

約数の個数: 48

約数和(自身を含む): 49534464

約数和(自身を除く): 29008924

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 271, 541, 542, 1082, 1084, 1355, 1897, 2164, 2705, 2710, 3787, 3794, 5410, 5420, 7574, 7588, 9485, 10820, 15148, 18935, 18970, 37870, 37940, 75740, 146611, 293222, 586444, 733055, 1026277, 1466110, 2052554, 2932220, 4105108, 5131385, 10262770, 20525540]

約数ペア:

[(1, 20525540), (2, 10262770), (4, 5131385), (5, 4105108), (7, 2932220), (10, 2052554), (14, 1466110), (20, 1026277), (28, 733055), (35, 586444), (70, 293222), (140, 146611), (271, 75740), (541, 37940), (542, 37870), (1082, 18970), (1084, 18935), (1355, 15148), (1897, 10820), (2164, 9485), (2705, 7588), (2710, 7574), (3787, 5420), (3794, 5410)]