21128121

素因数分解:

$3^5\times 7^1\times {\mathrm{12421}}^1$

素因数の和:12443

約数の個数: 24

約数和(自身を含む): 36172864

約数和(自身を除く): 15044743

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 1701, 12421, 37263, 86947, 111789, 260841, 335367, 782523, 1006101, 2347569, 3018303, 7042707, 21128121]

約数ペア:

[(1, 21128121), (3, 7042707), (7, 3018303), (9, 2347569), (21, 1006101), (27, 782523), (63, 335367), (81, 260841), (189, 111789), (243, 86947), (567, 37263), (1701, 12421)]