19978903

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{659}}^1$

素因数の和:798

約数の個数: 16

約数和(自身を含む): 23569920

約数和(自身を除く): 3591017

約数列:

[1, 7, 61, 71, 427, 497, 659, 4331, 4613, 30317, 40199, 46789, 281393, 327523, 2854129, 19978903]

約数ペア:

[(1, 19978903), (7, 2854129), (61, 327523), (71, 281393), (427, 46789), (497, 40199), (659, 30317), (4331, 4613)]