21447020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{307}}^1\times {\mathrm{499}}^1$

素因数の和:822

約数の個数: 48

約数和(自身を含む): 51744000

約数和(自身を除く): 30296980

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 307, 499, 614, 998, 1228, 1535, 1996, 2149, 2495, 3070, 3493, 4298, 4990, 6140, 6986, 8596, 9980, 10745, 13972, 17465, 21490, 34930, 42980, 69860, 153193, 306386, 612772, 765965, 1072351, 1531930, 2144702, 3063860, 4289404, 5361755, 10723510, 21447020]

約数ペア:

[(1, 21447020), (2, 10723510), (4, 5361755), (5, 4289404), (7, 3063860), (10, 2144702), (14, 1531930), (20, 1072351), (28, 765965), (35, 612772), (70, 306386), (140, 153193), (307, 69860), (499, 42980), (614, 34930), (998, 21490), (1228, 17465), (1535, 13972), (1996, 10745), (2149, 9980), (2495, 8596), (3070, 6986), (3493, 6140), (4298, 4990)]