21437157

素因数分解:

$3^1\times 7^3\times {\mathrm{83}}^1\times {\mathrm{251}}^1$

素因数の和:358

約数の個数: 32

約数和(自身を含む): 33868800

約数和(自身を除く): 12431643

約数列:

[1, 3, 7, 21, 49, 83, 147, 249, 251, 343, 581, 753, 1029, 1743, 1757, 4067, 5271, 12201, 12299, 20833, 28469, 36897, 62499, 85407, 86093, 145831, 258279, 437493, 1020817, 3062451, 7145719, 21437157]

約数ペア:

[(1, 21437157), (3, 7145719), (7, 3062451), (21, 1020817), (49, 437493), (83, 258279), (147, 145831), (249, 86093), (251, 85407), (343, 62499), (581, 36897), (753, 28469), (1029, 20833), (1743, 12299), (1757, 12201), (4067, 5271)]