21005271

素因数分解:

$3^3\times 7^2\times {\mathrm{15877}}^1$

素因数の和:15900

約数の個数: 24

約数和(自身を含む): 36201840

約数和(自身を除く): 15196569

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 15877, 47631, 111139, 142893, 333417, 428679, 777973, 1000251, 2333919, 3000753, 7001757, 21005271]

約数ペア:

[(1, 21005271), (3, 7001757), (7, 3000753), (9, 2333919), (21, 1000251), (27, 777973), (49, 428679), (63, 333417), (147, 142893), (189, 111139), (441, 47631), (1323, 15877)]