21784895

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{431}}^1\times {\mathrm{919}}^1$

素因数の和:1366

約数の個数: 16

約数和(自身を含む): 28615680

約数和(自身を除く): 6830785

約数列:

[1, 5, 11, 55, 431, 919, 2155, 4595, 4741, 10109, 23705, 50545, 396089, 1980445, 4356979, 21784895]

約数ペア:

[(1, 21784895), (5, 4356979), (11, 1980445), (55, 396089), (431, 50545), (919, 23705), (2155, 10109), (4595, 4741)]