21278620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{311}}^2$

素因数の和:642

約数の個数: 36

約数和(自身を含む): 48904632

約数和(自身を除く): 27626012

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 311, 622, 1244, 1555, 3110, 3421, 6220, 6842, 13684, 17105, 34210, 68420, 96721, 193442, 386884, 483605, 967210, 1063931, 1934420, 2127862, 4255724, 5319655, 10639310, 21278620]

約数ペア:

[(1, 21278620), (2, 10639310), (4, 5319655), (5, 4255724), (10, 2127862), (11, 1934420), (20, 1063931), (22, 967210), (44, 483605), (55, 386884), (110, 193442), (220, 96721), (311, 68420), (622, 34210), (1244, 17105), (1555, 13684), (3110, 6842), (3421, 6220)]