19991356

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1381}}^1$

素因数の和:1450

約数の個数: 48

約数和(自身を含む): 44577792

約数和(自身を除く): 24586436

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 44, 47, 77, 94, 154, 188, 308, 329, 517, 658, 1034, 1316, 1381, 2068, 2762, 3619, 5524, 7238, 9667, 14476, 15191, 19334, 30382, 38668, 60764, 64907, 106337, 129814, 212674, 259628, 425348, 454349, 713977, 908698, 1427954, 1817396, 2855908, 4997839, 9995678, 19991356]

約数ペア:

[(1, 19991356), (2, 9995678), (4, 4997839), (7, 2855908), (11, 1817396), (14, 1427954), (22, 908698), (28, 713977), (44, 454349), (47, 425348), (77, 259628), (94, 212674), (154, 129814), (188, 106337), (308, 64907), (329, 60764), (517, 38668), (658, 30382), (1034, 19334), (1316, 15191), (1381, 14476), (2068, 9667), (2762, 7238), (3619, 5524)]