20818820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{173}}^1\times {\mathrm{547}}^1$

素因数の和:740

約数の個数: 48

約数和(自身を含む): 48057408

約数和(自身を除く): 27238588

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 173, 220, 346, 547, 692, 865, 1094, 1730, 1903, 2188, 2735, 3460, 3806, 5470, 6017, 7612, 9515, 10940, 12034, 19030, 24068, 30085, 38060, 60170, 94631, 120340, 189262, 378524, 473155, 946310, 1040941, 1892620, 2081882, 4163764, 5204705, 10409410, 20818820]

約数ペア:

[(1, 20818820), (2, 10409410), (4, 5204705), (5, 4163764), (10, 2081882), (11, 1892620), (20, 1040941), (22, 946310), (44, 473155), (55, 378524), (110, 189262), (173, 120340), (220, 94631), (346, 60170), (547, 38060), (692, 30085), (865, 24068), (1094, 19030), (1730, 12034), (1903, 10940), (2188, 9515), (2735, 7612), (3460, 6017), (3806, 5470)]