21489475

素因数分解:

$5^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{281}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 33569280

約数和(自身を除く): 12079805

約数列:

[1, 5, 7, 19, 23, 25, 35, 95, 115, 133, 161, 175, 281, 437, 475, 575, 665, 805, 1405, 1967, 2185, 3059, 3325, 4025, 5339, 6463, 7025, 9835, 10925, 15295, 26695, 32315, 37373, 45241, 49175, 76475, 122797, 133475, 161575, 186865, 226205, 613985, 859579, 934325, 1131025, 3069925, 4297895, 21489475]

約数ペア:

[(1, 21489475), (5, 4297895), (7, 3069925), (19, 1131025), (23, 934325), (25, 859579), (35, 613985), (95, 226205), (115, 186865), (133, 161575), (161, 133475), (175, 122797), (281, 76475), (437, 49175), (475, 45241), (575, 37373), (665, 32315), (805, 26695), (1405, 15295), (1967, 10925), (2185, 9835), (3059, 7025), (3325, 6463), (4025, 5339)]