21907781

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{3917}}^1$

素因数の和:3988

約数の個数: 16

約数和(自身を含む): 27081216

約数和(自身を除く): 5173435

約数列:

[1, 7, 17, 47, 119, 329, 799, 3917, 5593, 27419, 66589, 184099, 466123, 1288693, 3129683, 21907781]

約数ペア:

[(1, 21907781), (7, 3129683), (17, 1288693), (47, 466123), (119, 184099), (329, 66589), (799, 27419), (3917, 5593)]