640420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:132

約数の個数: 48

約数和(自身を含む): 1524096

約数和(自身を除く): 883676

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 41, 44, 55, 71, 82, 110, 142, 164, 205, 220, 284, 355, 410, 451, 710, 781, 820, 902, 1420, 1562, 1804, 2255, 2911, 3124, 3905, 4510, 5822, 7810, 9020, 11644, 14555, 15620, 29110, 32021, 58220, 64042, 128084, 160105, 320210, 640420]

約数ペア:

[(1, 640420), (2, 320210), (4, 160105), (5, 128084), (10, 64042), (11, 58220), (20, 32021), (22, 29110), (41, 15620), (44, 14555), (55, 11644), (71, 9020), (82, 7810), (110, 5822), (142, 4510), (164, 3905), (205, 3124), (220, 2911), (284, 2255), (355, 1804), (410, 1562), (451, 1420), (710, 902), (781, 820)]