72821721

素因数分解:

$3^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{131}}^1\times {\mathrm{257}}^1$

素因数の和:501

約数の個数: 32

約数和(自身を含む): 113338368

約数和(自身を除く): 40516647

約数列:

[1, 3, 7, 21, 103, 131, 257, 309, 393, 721, 771, 917, 1799, 2163, 2751, 5397, 13493, 26471, 33667, 40479, 79413, 94451, 101001, 185297, 235669, 283353, 555891, 707007, 3467701, 10403103, 24273907, 72821721]

約数ペア:

[(1, 72821721), (3, 24273907), (7, 10403103), (21, 3467701), (103, 707007), (131, 555891), (257, 283353), (309, 235669), (393, 185297), (721, 101001), (771, 94451), (917, 79413), (1799, 40479), (2163, 33667), (2751, 26471), (5397, 13493)]