21473781

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53819}}^1$

素因数の和:53848

約数の個数: 16

約数和(自身を含む): 34444800

約数和(自身を除く): 12971019

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53819, 161457, 376733, 1022561, 1130199, 3067683, 7157927, 21473781]

約数ペア:

[(1, 21473781), (3, 7157927), (7, 3067683), (19, 1130199), (21, 1022561), (57, 376733), (133, 161457), (399, 53819)]