21144680

素因数分解:

$2^3\times 5^1\times {\mathrm{139}}^1\times {\mathrm{3803}}^1$

素因数の和:3953

約数の個数: 32

約数和(自身を含む): 47930400

約数和(自身を除く): 26785720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 139, 278, 556, 695, 1112, 1390, 2780, 3803, 5560, 7606, 15212, 19015, 30424, 38030, 76060, 152120, 528617, 1057234, 2114468, 2643085, 4228936, 5286170, 10572340, 21144680]

約数ペア:

[(1, 21144680), (2, 10572340), (4, 5286170), (5, 4228936), (8, 2643085), (10, 2114468), (20, 1057234), (40, 528617), (139, 152120), (278, 76060), (556, 38030), (695, 30424), (1112, 19015), (1390, 15212), (2780, 7606), (3803, 5560)]