21297280

素因数分解:

$2^7\times 5^1\times {\mathrm{107}}^1\times {\mathrm{311}}^1$

素因数の和:437

約数の個数: 64

約数和(自身を含む): 51554880

約数和(自身を除く): 30257600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 107, 128, 160, 214, 311, 320, 428, 535, 622, 640, 856, 1070, 1244, 1555, 1712, 2140, 2488, 3110, 3424, 4280, 4976, 6220, 6848, 8560, 9952, 12440, 13696, 17120, 19904, 24880, 33277, 34240, 39808, 49760, 66554, 68480, 99520, 133108, 166385, 199040, 266216, 332770, 532432, 665540, 1064864, 1331080, 2129728, 2662160, 4259456, 5324320, 10648640, 21297280]

約数ペア:

[(1, 21297280), (2, 10648640), (4, 5324320), (5, 4259456), (8, 2662160), (10, 2129728), (16, 1331080), (20, 1064864), (32, 665540), (40, 532432), (64, 332770), (80, 266216), (107, 199040), (128, 166385), (160, 133108), (214, 99520), (311, 68480), (320, 66554), (428, 49760), (535, 39808), (622, 34240), (640, 33277), (856, 24880), (1070, 19904), (1244, 17120), (1555, 13696), (1712, 12440), (2140, 9952), (2488, 8560), (3110, 6848), (3424, 6220), (4280, 4976)]