19720145

素因数分解:

$5^1\times {\mathrm{29}}^1\times {\mathrm{307}}^1\times {\mathrm{443}}^1$

素因数の和:784

約数の個数: 16

約数和(自身を含む): 24615360

約数和(自身を除く): 4895215

約数列:

[1, 5, 29, 145, 307, 443, 1535, 2215, 8903, 12847, 44515, 64235, 136001, 680005, 3944029, 19720145]

約数ペア:

[(1, 19720145), (5, 3944029), (29, 680005), (145, 136001), (307, 64235), (443, 44515), (1535, 12847), (2215, 8903)]