18971981

素因数分解:

$7^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1\times {\mathrm{647}}^1$

素因数の和:784

約数の個数: 16

約数和(自身を含む): 22394880

約数和(自身を除く): 3422899

約数列:

[1, 7, 59, 71, 413, 497, 647, 4189, 4529, 29323, 38173, 45937, 267211, 321559, 2710283, 18971981]

約数ペア:

[(1, 18971981), (7, 2710283), (59, 321559), (71, 267211), (413, 45937), (497, 38173), (647, 29323), (4189, 4529)]