21780395

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47869}}^1$

素因数の和:47894

約数の個数: 16

約数和(自身を含む): 32168640

約数和(自身を除く): 10388245

約数列:

[1, 5, 7, 13, 35, 65, 91, 455, 47869, 239345, 335083, 622297, 1675415, 3111485, 4356079, 21780395]

約数ペア:

[(1, 21780395), (5, 4356079), (7, 3111485), (13, 1675415), (35, 622297), (65, 335083), (91, 239345), (455, 47869)]