21005811

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{13649}}^1$

素因数の和:13680

約数の個数: 20

約数和(自身を含む): 33033000

約数和(自身を除く): 12027189

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 513, 1539, 13649, 40947, 122841, 259331, 368523, 777993, 1105569, 2333979, 7001937, 21005811]

約数ペア:

[(1, 21005811), (3, 7001937), (9, 2333979), (19, 1105569), (27, 777993), (57, 368523), (81, 259331), (171, 122841), (513, 40947), (1539, 13649)]