21187340

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11903}}^1$

素因数の和:12001

約数の個数: 24

約数和(自身を含む): 44997120

約数和(自身を除く): 23809780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11903, 23806, 47612, 59515, 119030, 238060, 1059367, 2118734, 4237468, 5296835, 10593670, 21187340]

約数ペア:

[(1, 21187340), (2, 10593670), (4, 5296835), (5, 4237468), (10, 2118734), (20, 1059367), (89, 238060), (178, 119030), (356, 59515), (445, 47612), (890, 23806), (1780, 11903)]