21490640

素因数分解:

$2^4\times 5^1\times {\mathrm{353}}^1\times {\mathrm{761}}^1$

素因数の和:1127

約数の個数: 40

約数和(自身を含む): 50173128

約数和(自身を除く): 28682488

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 353, 706, 761, 1412, 1522, 1765, 2824, 3044, 3530, 3805, 5648, 6088, 7060, 7610, 12176, 14120, 15220, 28240, 30440, 60880, 268633, 537266, 1074532, 1343165, 2149064, 2686330, 4298128, 5372660, 10745320, 21490640]

約数ペア:

[(1, 21490640), (2, 10745320), (4, 5372660), (5, 4298128), (8, 2686330), (10, 2149064), (16, 1343165), (20, 1074532), (40, 537266), (80, 268633), (353, 60880), (706, 30440), (761, 28240), (1412, 15220), (1522, 14120), (1765, 12176), (2824, 7610), (3044, 7060), (3530, 6088), (3805, 5648)]