256465720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{915949}}^1$

素因数の和:915967

約数の個数: 32

約数和(自身を含む): 659484000

約数和(自身を除く): 403018280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 915949, 1831898, 3663796, 4579745, 6411643, 7327592, 9159490, 12823286, 18318980, 25646572, 32058215, 36637960, 51293144, 64116430, 128232860, 256465720]

約数ペア:

[(1, 256465720), (2, 128232860), (4, 64116430), (5, 51293144), (7, 36637960), (8, 32058215), (10, 25646572), (14, 18318980), (20, 12823286), (28, 9159490), (35, 7327592), (40, 6411643), (56, 4579745), (70, 3663796), (140, 1831898), (280, 915949)]