21508221

素因数分解:

$3^1\times 7^1\times {\mathrm{647}}^1\times {\mathrm{1583}}^1$

素因数の和:2240

約数の個数: 16

約数和(自身を含む): 32845824

約数和(自身を除く): 11337603

約数列:

[1, 3, 7, 21, 647, 1583, 1941, 4529, 4749, 11081, 13587, 33243, 1024201, 3072603, 7169407, 21508221]

約数ペア:

[(1, 21508221), (3, 7169407), (7, 3072603), (21, 1024201), (647, 33243), (1583, 13587), (1941, 11081), (4529, 4749)]