21839860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{257}}^1\times {\mathrm{607}}^1$

素因数の和:880

約数の個数: 48

約数和(自身を含む): 52706304

約数和(自身を除く): 30866444

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 257, 514, 607, 1028, 1214, 1285, 1799, 2428, 2570, 3035, 3598, 4249, 5140, 6070, 7196, 8498, 8995, 12140, 16996, 17990, 21245, 35980, 42490, 84980, 155999, 311998, 623996, 779995, 1091993, 1559990, 2183986, 3119980, 4367972, 5459965, 10919930, 21839860]

約数ペア:

[(1, 21839860), (2, 10919930), (4, 5459965), (5, 4367972), (7, 3119980), (10, 2183986), (14, 1559990), (20, 1091993), (28, 779995), (35, 623996), (70, 311998), (140, 155999), (257, 84980), (514, 42490), (607, 35980), (1028, 21245), (1214, 17990), (1285, 16996), (1799, 12140), (2428, 8995), (2570, 8498), (3035, 7196), (3598, 6070), (4249, 5140)]