20965959

素因数分解:

$3^4\times 7^1\times {\mathrm{103}}^1\times {\mathrm{359}}^1$

素因数の和:481

約数の個数: 40

約数和(自身を含む): 36241920

約数和(自身を除く): 15275961

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 103, 189, 309, 359, 567, 721, 927, 1077, 2163, 2513, 2781, 3231, 6489, 7539, 8343, 9693, 19467, 22617, 29079, 36977, 58401, 67851, 110931, 203553, 258839, 332793, 776517, 998379, 2329551, 2995137, 6988653, 20965959]

約数ペア:

[(1, 20965959), (3, 6988653), (7, 2995137), (9, 2329551), (21, 998379), (27, 776517), (63, 332793), (81, 258839), (103, 203553), (189, 110931), (309, 67851), (359, 58401), (567, 36977), (721, 29079), (927, 22617), (1077, 19467), (2163, 9693), (2513, 8343), (2781, 7539), (3231, 6489)]