21398140

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5431}}^1$

素因数の和:5637

約数の個数: 24

約数和(自身を含む): 45172512

約数和(自身を除く): 23774372

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5431, 10862, 21724, 27155, 54310, 108620, 1069907, 2139814, 4279628, 5349535, 10699070, 21398140]

約数ペア:

[(1, 21398140), (2, 10699070), (4, 5349535), (5, 4279628), (10, 2139814), (20, 1069907), (197, 108620), (394, 54310), (788, 27155), (985, 21724), (1970, 10862), (3940, 5431)]