21900403

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{431}}^1$

素因数の和:523

約数の個数: 24

約数和(自身を含む): 27480384

約数和(自身を除く): 5579981

約数列:

[1, 7, 17, 49, 61, 119, 427, 431, 833, 1037, 2989, 3017, 7259, 7327, 21119, 26291, 50813, 51289, 184037, 359023, 446947, 1288259, 3128629, 21900403]

約数ペア:

[(1, 21900403), (7, 3128629), (17, 1288259), (49, 446947), (61, 359023), (119, 184037), (427, 51289), (431, 50813), (833, 26291), (1037, 21119), (2989, 7327), (3017, 7259)]