20671585

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 28304640

約数和(自身を除く): 7633055

約数列:

[1, 5, 11, 41, 55, 89, 103, 205, 445, 451, 515, 979, 1133, 2255, 3649, 4223, 4895, 5665, 9167, 18245, 21115, 40139, 45835, 46453, 100837, 200695, 232265, 375847, 504185, 1879235, 4134317, 20671585]

約数ペア:

[(1, 20671585), (5, 4134317), (11, 1879235), (41, 504185), (55, 375847), (89, 232265), (103, 200695), (205, 100837), (445, 46453), (451, 45835), (515, 40139), (979, 21115), (1133, 18245), (2255, 9167), (3649, 5665), (4223, 4895)]