21440440

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10939}}^1$

素因数の和:10964

約数の個数: 48

約数和(自身を含む): 56122200

約数和(自身を除く): 34681760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10939, 21878, 43756, 54695, 76573, 87512, 109390, 153146, 218780, 306292, 382865, 437560, 536011, 612584, 765730, 1072022, 1531460, 2144044, 2680055, 3062920, 4288088, 5360110, 10720220, 21440440]

約数ペア:

[(1, 21440440), (2, 10720220), (4, 5360110), (5, 4288088), (7, 3062920), (8, 2680055), (10, 2144044), (14, 1531460), (20, 1072022), (28, 765730), (35, 612584), (40, 536011), (49, 437560), (56, 382865), (70, 306292), (98, 218780), (140, 153146), (196, 109390), (245, 87512), (280, 76573), (392, 54695), (490, 43756), (980, 21878), (1960, 10939)]