20921439

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{47}}^2$

素因数の和:156

約数の個数: 48

約数和(自身を含む): 36400896

約数和(自身を除く): 15479457

約数列:

[1, 3, 7, 11, 21, 33, 41, 47, 77, 123, 141, 231, 287, 329, 451, 517, 861, 987, 1353, 1551, 1927, 2209, 3157, 3619, 5781, 6627, 9471, 10857, 13489, 15463, 21197, 24299, 40467, 46389, 63591, 72897, 90569, 148379, 170093, 271707, 445137, 510279, 633983, 996259, 1901949, 2988777, 6973813, 20921439]

約数ペア:

[(1, 20921439), (3, 6973813), (7, 2988777), (11, 1901949), (21, 996259), (33, 633983), (41, 510279), (47, 445137), (77, 271707), (123, 170093), (141, 148379), (231, 90569), (287, 72897), (329, 63591), (451, 46389), (517, 40467), (861, 24299), (987, 21197), (1353, 15463), (1551, 13489), (1927, 10857), (2209, 9471), (3157, 6627), (3619, 5781)]