21209405

素因数分解:

$5^1\times 7^3\times {\mathrm{83}}^1\times {\mathrm{149}}^1$

素因数の和:258

約数の個数: 32

約数和(自身を含む): 30240000

約数和(自身を除く): 9030595

約数列:

[1, 5, 7, 35, 49, 83, 149, 245, 343, 415, 581, 745, 1043, 1715, 2905, 4067, 5215, 7301, 12367, 20335, 28469, 36505, 51107, 61835, 86569, 142345, 255535, 432845, 605983, 3029915, 4241881, 21209405]

約数ペア:

[(1, 21209405), (5, 4241881), (7, 3029915), (35, 605983), (49, 432845), (83, 255535), (149, 142345), (245, 86569), (343, 61835), (415, 51107), (581, 36505), (745, 28469), (1043, 20335), (1715, 12367), (2905, 7301), (4067, 5215)]