21457000

素因数分解:

$2^3\times 5^3\times {\mathrm{43}}^1\times {\mathrm{499}}^1$

素因数の和:563

約数の個数: 64

約数和(自身を含む): 51480000

約数和(自身を除く): 30023000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 43, 50, 86, 100, 125, 172, 200, 215, 250, 344, 430, 499, 500, 860, 998, 1000, 1075, 1720, 1996, 2150, 2495, 3992, 4300, 4990, 5375, 8600, 9980, 10750, 12475, 19960, 21457, 21500, 24950, 42914, 43000, 49900, 62375, 85828, 99800, 107285, 124750, 171656, 214570, 249500, 429140, 499000, 536425, 858280, 1072850, 2145700, 2682125, 4291400, 5364250, 10728500, 21457000]

約数ペア:

[(1, 21457000), (2, 10728500), (4, 5364250), (5, 4291400), (8, 2682125), (10, 2145700), (20, 1072850), (25, 858280), (40, 536425), (43, 499000), (50, 429140), (86, 249500), (100, 214570), (125, 171656), (172, 124750), (200, 107285), (215, 99800), (250, 85828), (344, 62375), (430, 49900), (499, 43000), (500, 42914), (860, 24950), (998, 21500), (1000, 21457), (1075, 19960), (1720, 12475), (1996, 10750), (2150, 9980), (2495, 8600), (3992, 5375), (4300, 4990)]