21331480

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13007}}^1$

素因数の和:13059

約数の個数: 32

約数和(自身を含む): 49170240

約数和(自身を除く): 27838760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13007, 26014, 52028, 65035, 104056, 130070, 260140, 520280, 533287, 1066574, 2133148, 2666435, 4266296, 5332870, 10665740, 21331480]

約数ペア:

[(1, 21331480), (2, 10665740), (4, 5332870), (5, 4266296), (8, 2666435), (10, 2133148), (20, 1066574), (40, 533287), (41, 520280), (82, 260140), (164, 130070), (205, 104056), (328, 65035), (410, 52028), (820, 26014), (1640, 13007)]