21451521

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{78577}}^1$

素因数の和:78600

約数の個数: 16

約数和(自身を含む): 35202944

約数和(自身を除く): 13751423

約数列:

[1, 3, 7, 13, 21, 39, 91, 273, 78577, 235731, 550039, 1021501, 1650117, 3064503, 7150507, 21451521]

約数ペア:

[(1, 21451521), (3, 7150507), (7, 3064503), (13, 1650117), (21, 1021501), (39, 550039), (91, 235731), (273, 78577)]