19997965

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{103}}^2$

素因数の和:253

約数の個数: 24

約数和(自身を含む): 26996760

約数和(自身を除く): 6998795

約数列:

[1, 5, 13, 29, 65, 103, 145, 377, 515, 1339, 1885, 2987, 6695, 10609, 14935, 38831, 53045, 137917, 194155, 307661, 689585, 1538305, 3999593, 19997965]

約数ペア:

[(1, 19997965), (5, 3999593), (13, 1538305), (29, 689585), (65, 307661), (103, 194155), (145, 137917), (377, 53045), (515, 38831), (1339, 14935), (1885, 10609), (2987, 6695)]