19785857

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{349}}^1$

素因数の和:465

約数の個数: 24

約数和(自身を含む): 25137000

約数和(自身を除く): 5351143

約数列:

[1, 7, 13, 49, 89, 91, 349, 623, 637, 1157, 2443, 4361, 4537, 8099, 17101, 31061, 31759, 56693, 217427, 222313, 403793, 1521989, 2826551, 19785857]

約数ペア:

[(1, 19785857), (7, 2826551), (13, 1521989), (49, 403793), (89, 222313), (91, 217427), (349, 56693), (623, 31759), (637, 31061), (1157, 17101), (2443, 8099), (4361, 4537)]