21076821

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{977}}^1$

素因数の和:1050

約数の個数: 32

約数和(自身を含む): 33799680

約数和(自身を除く): 12722859

約数列:

[1, 3, 9, 17, 27, 47, 51, 141, 153, 423, 459, 799, 977, 1269, 2397, 2931, 7191, 8793, 16609, 21573, 26379, 45919, 49827, 137757, 149481, 413271, 448443, 780623, 1239813, 2341869, 7025607, 21076821]

約数ペア:

[(1, 21076821), (3, 7025607), (9, 2341869), (17, 1239813), (27, 780623), (47, 448443), (51, 413271), (141, 149481), (153, 137757), (423, 49827), (459, 45919), (799, 26379), (977, 21573), (1269, 16609), (2397, 8793), (2931, 7191)]