20349980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1061}}^1$

素因数の和:1214

約数の個数: 48

約数和(自身を含む): 49242816

約数和(自身を除く): 28892836

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 137, 140, 274, 548, 685, 959, 1061, 1370, 1918, 2122, 2740, 3836, 4244, 4795, 5305, 7427, 9590, 10610, 14854, 19180, 21220, 29708, 37135, 74270, 145357, 148540, 290714, 581428, 726785, 1017499, 1453570, 2034998, 2907140, 4069996, 5087495, 10174990, 20349980]

約数ペア:

[(1, 20349980), (2, 10174990), (4, 5087495), (5, 4069996), (7, 2907140), (10, 2034998), (14, 1453570), (20, 1017499), (28, 726785), (35, 581428), (70, 290714), (137, 148540), (140, 145357), (274, 74270), (548, 37135), (685, 29708), (959, 21220), (1061, 19180), (1370, 14854), (1918, 10610), (2122, 9590), (2740, 7427), (3836, 5305), (4244, 4795)]