21219740

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{449}}^1$

素因数の和:614

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 26408260

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 139, 170, 278, 340, 449, 556, 695, 898, 1390, 1796, 2245, 2363, 2780, 4490, 4726, 7633, 8980, 9452, 11815, 15266, 23630, 30532, 38165, 47260, 62411, 76330, 124822, 152660, 249644, 312055, 624110, 1060987, 1248220, 2121974, 4243948, 5304935, 10609870, 21219740]

約数ペア:

[(1, 21219740), (2, 10609870), (4, 5304935), (5, 4243948), (10, 2121974), (17, 1248220), (20, 1060987), (34, 624110), (68, 312055), (85, 249644), (139, 152660), (170, 124822), (278, 76330), (340, 62411), (449, 47260), (556, 38165), (695, 30532), (898, 23630), (1390, 15266), (1796, 11815), (2245, 9452), (2363, 8980), (2780, 7633), (4490, 4726)]