21353780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{1201}}^1$

素因数の和:1344

約数の個数: 48

約数和(自身を含む): 51695616

約数和(自身を除く): 30341836

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1201, 1270, 1778, 2402, 2540, 3556, 4445, 4804, 6005, 8407, 8890, 12010, 16814, 17780, 24020, 33628, 42035, 84070, 152527, 168140, 305054, 610108, 762635, 1067689, 1525270, 2135378, 3050540, 4270756, 5338445, 10676890, 21353780]

約数ペア:

[(1, 21353780), (2, 10676890), (4, 5338445), (5, 4270756), (7, 3050540), (10, 2135378), (14, 1525270), (20, 1067689), (28, 762635), (35, 610108), (70, 305054), (127, 168140), (140, 152527), (254, 84070), (508, 42035), (635, 33628), (889, 24020), (1201, 17780), (1270, 16814), (1778, 12010), (2402, 8890), (2540, 8407), (3556, 6005), (4445, 4804)]