21297728

素因数分解:

$2^6\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:235

約数の個数: 56

約数和(自身を含む): 44256960

約数和(自身を除く): 22959232

約数列:

[1, 2, 4, 8, 16, 32, 43, 64, 71, 86, 109, 142, 172, 218, 284, 344, 436, 568, 688, 872, 1136, 1376, 1744, 2272, 2752, 3053, 3488, 4544, 4687, 6106, 6976, 7739, 9374, 12212, 15478, 18748, 24424, 30956, 37496, 48848, 61912, 74992, 97696, 123824, 149984, 195392, 247648, 299968, 332777, 495296, 665554, 1331108, 2662216, 5324432, 10648864, 21297728]

約数ペア:

[(1, 21297728), (2, 10648864), (4, 5324432), (8, 2662216), (16, 1331108), (32, 665554), (43, 495296), (64, 332777), (71, 299968), (86, 247648), (109, 195392), (142, 149984), (172, 123824), (218, 97696), (284, 74992), (344, 61912), (436, 48848), (568, 37496), (688, 30956), (872, 24424), (1136, 18748), (1376, 15478), (1744, 12212), (2272, 9374), (2752, 7739), (3053, 6976), (3488, 6106), (4544, 4687)]