21557907

素因数分解:

$3^4\times 7^1\times {\mathrm{193}}^1\times {\mathrm{197}}^1$

素因数の和:409

約数の個数: 40

約数和(自身を含む): 37182816

約数和(自身を除く): 15624909

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 193, 197, 567, 579, 591, 1351, 1379, 1737, 1773, 4053, 4137, 5211, 5319, 12159, 12411, 15633, 15957, 36477, 37233, 38021, 109431, 111699, 114063, 266147, 342189, 798441, 1026567, 2395323, 3079701, 7185969, 21557907]

約数ペア:

[(1, 21557907), (3, 7185969), (7, 3079701), (9, 2395323), (21, 1026567), (27, 798441), (63, 342189), (81, 266147), (189, 114063), (193, 111699), (197, 109431), (567, 38021), (579, 37233), (591, 36477), (1351, 15957), (1379, 15633), (1737, 12411), (1773, 12159), (4053, 5319), (4137, 5211)]