21257241

素因数分解:

$3^1\times {\mathrm{79}}^1\times {\mathrm{257}}^1\times {\mathrm{349}}^1$

素因数の和:688

約数の個数: 16

約数和(自身を含む): 28896000

約数和(自身を除く): 7638759

約数列:

[1, 3, 79, 237, 257, 349, 771, 1047, 20303, 27571, 60909, 82713, 89693, 269079, 7085747, 21257241]

約数ペア:

[(1, 21257241), (3, 7085747), (79, 269079), (237, 89693), (257, 82713), (349, 60909), (771, 27571), (1047, 20303)]