21781991

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{457}}^1\times {\mathrm{619}}^1$

素因数の和:1094

約数の個数: 16

約数和(自身を含む): 27260160

約数和(自身を除く): 5478169

約数列:

[1, 7, 11, 77, 457, 619, 3199, 4333, 5027, 6809, 35189, 47663, 282883, 1980181, 3111713, 21781991]

約数ペア:

[(1, 21781991), (7, 3111713), (11, 1980181), (77, 282883), (457, 47663), (619, 35189), (3199, 6809), (4333, 5027)]