20517231

素因数分解:

$3^1\times 7^3\times {\mathrm{127}}^1\times {\mathrm{157}}^1$

素因数の和:308

約数の個数: 32

約数和(自身を含む): 32358400

約数和(自身を除く): 11841169

約数列:

[1, 3, 7, 21, 49, 127, 147, 157, 343, 381, 471, 889, 1029, 1099, 2667, 3297, 6223, 7693, 18669, 19939, 23079, 43561, 53851, 59817, 130683, 139573, 161553, 418719, 977011, 2931033, 6839077, 20517231]

約数ペア:

[(1, 20517231), (3, 6839077), (7, 2931033), (21, 977011), (49, 418719), (127, 161553), (147, 139573), (157, 130683), (343, 59817), (381, 53851), (471, 43561), (889, 23079), (1029, 19939), (1099, 18669), (2667, 7693), (3297, 6223)]