19991881

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{12923}}^1$

素因数の和:12960

約数の個数: 16

約数和(自身を含む): 26054784

約数和(自身を除く): 6062903

約数列:

[1, 7, 13, 17, 91, 119, 221, 1547, 12923, 90461, 167999, 219691, 1175993, 1537837, 2855983, 19991881]

約数ペア:

[(1, 19991881), (7, 2855983), (13, 1537837), (17, 1175993), (91, 219691), (119, 167999), (221, 90461), (1547, 12923)]