21165991

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{367}}^1$

素因数の和:499

約数の個数: 24

約数和(自身を含む): 27184896

約数和(自身を除く): 6018905

約数列:

[1, 7, 11, 49, 77, 107, 367, 539, 749, 1177, 2569, 4037, 5243, 8239, 17983, 28259, 39269, 57673, 197813, 274883, 431959, 1924181, 3023713, 21165991]

約数ペア:

[(1, 21165991), (7, 3023713), (11, 1924181), (49, 431959), (77, 274883), (107, 197813), (367, 57673), (539, 39269), (749, 28259), (1177, 17983), (2569, 8239), (4037, 5243)]