19985560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{521}}^1$

素因数の和:676

約数の個数: 64

約数和(自身を含む): 51865920

約数和(自身を除く): 31880360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 137, 140, 274, 280, 521, 548, 685, 959, 1042, 1096, 1370, 1918, 2084, 2605, 2740, 3647, 3836, 4168, 4795, 5210, 5480, 7294, 7672, 9590, 10420, 14588, 18235, 19180, 20840, 29176, 36470, 38360, 71377, 72940, 142754, 145880, 285508, 356885, 499639, 571016, 713770, 999278, 1427540, 1998556, 2498195, 2855080, 3997112, 4996390, 9992780, 19985560]

約数ペア:

[(1, 19985560), (2, 9992780), (4, 4996390), (5, 3997112), (7, 2855080), (8, 2498195), (10, 1998556), (14, 1427540), (20, 999278), (28, 713770), (35, 571016), (40, 499639), (56, 356885), (70, 285508), (137, 145880), (140, 142754), (274, 72940), (280, 71377), (521, 38360), (548, 36470), (685, 29176), (959, 20840), (1042, 19180), (1096, 18235), (1370, 14588), (1918, 10420), (2084, 9590), (2605, 7672), (2740, 7294), (3647, 5480), (3836, 5210), (4168, 4795)]