19991993

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{181}}^1\times {\mathrm{509}}^1$

素因数の和:728

約数の個数: 16

約数和(自身を含む): 23761920

約数和(自身を除く): 3769927

約数列:

[1, 7, 31, 181, 217, 509, 1267, 3563, 5611, 15779, 39277, 92129, 110453, 644903, 2855999, 19991993]

約数ペア:

[(1, 19991993), (7, 2855999), (31, 644903), (181, 110453), (217, 92129), (509, 39277), (1267, 15779), (3563, 5611)]