21255661

素因数分解:

$7^2\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{79}}^1$

素因数の和:146

約数の個数: 36

約数和(自身を含む): 27998400

約数和(自身を除く): 6742739

約数列:

[1, 7, 17, 19, 49, 79, 119, 133, 289, 323, 553, 833, 931, 1343, 1501, 2023, 2261, 3871, 5491, 9401, 10507, 14161, 15827, 22831, 25517, 38437, 65807, 73549, 159817, 178619, 269059, 433789, 1118719, 1250333, 3036523, 21255661]

約数ペア:

[(1, 21255661), (7, 3036523), (17, 1250333), (19, 1118719), (49, 433789), (79, 269059), (119, 178619), (133, 159817), (289, 73549), (323, 65807), (553, 38437), (833, 25517), (931, 22831), (1343, 15827), (1501, 14161), (2023, 10507), (2261, 9401), (3871, 5491)]