81990181

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{9901}}^1$

素因数の和:9941

約数の個数: 18

約数和(自身を含む): 103287762

約数和(自身を除く): 21297581

約数列:

[1, 7, 13, 49, 91, 169, 637, 1183, 8281, 9901, 69307, 128713, 485149, 900991, 1673269, 6306937, 11712883, 81990181]

約数ペア:

[(1, 81990181), (7, 11712883), (13, 6306937), (49, 1673269), (91, 900991), (169, 485149), (637, 128713), (1183, 69307), (8281, 9901)]