21032221

素因数分解:

$7^2\times {\mathrm{19}}^2\times {\mathrm{29}}^1\times {\mathrm{41}}^1$

素因数の和:122

約数の個数: 36

約数和(自身を含む): 27363420

約数和(自身を除く): 6331199

約数列:

[1, 7, 19, 29, 41, 49, 133, 203, 287, 361, 551, 779, 931, 1189, 1421, 2009, 2527, 3857, 5453, 8323, 10469, 14801, 17689, 22591, 26999, 38171, 58261, 73283, 103607, 158137, 429229, 512981, 725249, 1106959, 3004603, 21032221]

約数ペア:

[(1, 21032221), (7, 3004603), (19, 1106959), (29, 725249), (41, 512981), (49, 429229), (133, 158137), (203, 103607), (287, 73283), (361, 58261), (551, 38171), (779, 26999), (931, 22591), (1189, 17689), (1421, 14801), (2009, 10469), (2527, 8323), (3857, 5453)]