28008778

素因数分解:

$2^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{139}}^1\times {\mathrm{389}}^1$

素因数の和:574

約数の個数: 32

約数和(自身を含む): 49795200

約数和(自身を除く): 21786422

約数列:

[1, 2, 7, 14, 37, 74, 139, 259, 278, 389, 518, 778, 973, 1946, 2723, 5143, 5446, 10286, 14393, 28786, 36001, 54071, 72002, 100751, 108142, 201502, 378497, 756994, 2000627, 4001254, 14004389, 28008778]

約数ペア:

[(1, 28008778), (2, 14004389), (7, 4001254), (14, 2000627), (37, 756994), (74, 378497), (139, 201502), (259, 108142), (278, 100751), (389, 72002), (518, 54071), (778, 36001), (973, 28786), (1946, 14393), (2723, 10286), (5143, 5446)]