21004940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{307}}^1\times {\mathrm{311}}^1$

素因数の和:638

約数の個数: 48

約数和(自身を含む): 48432384

約数和(自身を除く): 27427444

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 307, 311, 614, 622, 1228, 1244, 1535, 1555, 3070, 3110, 3377, 3421, 6140, 6220, 6754, 6842, 13508, 13684, 16885, 17105, 33770, 34210, 67540, 68420, 95477, 190954, 381908, 477385, 954770, 1050247, 1909540, 2100494, 4200988, 5251235, 10502470, 21004940]

約数ペア:

[(1, 21004940), (2, 10502470), (4, 5251235), (5, 4200988), (10, 2100494), (11, 1909540), (20, 1050247), (22, 954770), (44, 477385), (55, 381908), (110, 190954), (220, 95477), (307, 68420), (311, 67540), (614, 34210), (622, 33770), (1228, 17105), (1244, 16885), (1535, 13684), (1555, 13508), (3070, 6842), (3110, 6754), (3377, 6220), (3421, 6140)]