64847560

素因数分解:

$2^3\times 5^1\times {\mathrm{811}}^1\times {\mathrm{1999}}^1$

素因数の和:2821

約数の個数: 32

約数和(自身を含む): 146160000

約数和(自身を除く): 81312440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 811, 1622, 1999, 3244, 3998, 4055, 6488, 7996, 8110, 9995, 15992, 16220, 19990, 32440, 39980, 79960, 1621189, 3242378, 6484756, 8105945, 12969512, 16211890, 32423780, 64847560]

約数ペア:

[(1, 64847560), (2, 32423780), (4, 16211890), (5, 12969512), (8, 8105945), (10, 6484756), (20, 3242378), (40, 1621189), (811, 79960), (1622, 39980), (1999, 32440), (3244, 19990), (3998, 16220), (4055, 15992), (6488, 9995), (7996, 8110)]