21191680

素因数分解:

$2^{10}\times 5^1\times {\mathrm{4139}}^1$

素因数の和:4164

約数の個数: 44

約数和(自身を含む): 50847480

約数和(自身を除く): 29655800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2560, 4139, 5120, 8278, 16556, 20695, 33112, 41390, 66224, 82780, 132448, 165560, 264896, 331120, 529792, 662240, 1059584, 1324480, 2119168, 2648960, 4238336, 5297920, 10595840, 21191680]

約数ペア:

[(1, 21191680), (2, 10595840), (4, 5297920), (5, 4238336), (8, 2648960), (10, 2119168), (16, 1324480), (20, 1059584), (32, 662240), (40, 529792), (64, 331120), (80, 264896), (128, 165560), (160, 132448), (256, 82780), (320, 66224), (512, 41390), (640, 33112), (1024, 20695), (1280, 16556), (2560, 8278), (4139, 5120)]