18721780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{12157}}^1$

素因数の和:12184

約数の個数: 48

約数和(自身を含む): 49021056

約数和(自身を除く): 30299276

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 12157, 24314, 48628, 60785, 85099, 121570, 133727, 170198, 243140, 267454, 340396, 425495, 534908, 668635, 850990, 936089, 1337270, 1701980, 1872178, 2674540, 3744356, 4680445, 9360890, 18721780]

約数ペア:

[(1, 18721780), (2, 9360890), (4, 4680445), (5, 3744356), (7, 2674540), (10, 1872178), (11, 1701980), (14, 1337270), (20, 936089), (22, 850990), (28, 668635), (35, 534908), (44, 425495), (55, 340396), (70, 267454), (77, 243140), (110, 170198), (140, 133727), (154, 121570), (220, 85099), (308, 60785), (385, 48628), (770, 24314), (1540, 12157)]