820648040

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{31907}}^1$

素因数の和:32561

約数の個数: 32

約数和(自身を含む): 1849387680

約数和(自身を除く): 1028739640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 1286, 2572, 3215, 5144, 6430, 12860, 25720, 31907, 63814, 127628, 159535, 255256, 319070, 638140, 1276280, 20516201, 41032402, 82064804, 102581005, 164129608, 205162010, 410324020, 820648040]

約数ペア:

[(1, 820648040), (2, 410324020), (4, 205162010), (5, 164129608), (8, 102581005), (10, 82064804), (20, 41032402), (40, 20516201), (643, 1276280), (1286, 638140), (2572, 319070), (3215, 255256), (5144, 159535), (6430, 127628), (12860, 63814), (25720, 31907)]