20871620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13553}}^1$

素因数の和:13580

約数の個数: 48

約数和(自身を含む): 54649728

約数和(自身を除く): 33778108

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 13553, 27106, 54212, 67765, 94871, 135530, 149083, 189742, 271060, 298166, 379484, 474355, 596332, 745415, 948710, 1043581, 1490830, 1897420, 2087162, 2981660, 4174324, 5217905, 10435810, 20871620]

約数ペア:

[(1, 20871620), (2, 10435810), (4, 5217905), (5, 4174324), (7, 2981660), (10, 2087162), (11, 1897420), (14, 1490830), (20, 1043581), (22, 948710), (28, 745415), (35, 596332), (44, 474355), (55, 379484), (70, 298166), (77, 271060), (110, 189742), (140, 149083), (154, 135530), (220, 94871), (308, 67765), (385, 54212), (770, 27106), (1540, 13553)]