21217780

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{10937}}^1$

素因数の和:11043

約数の個数: 24

約数和(自身を含む): 45020808

約数和(自身を除く): 23803028

約数列:

[1, 2, 4, 5, 10, 20, 97, 194, 388, 485, 970, 1940, 10937, 21874, 43748, 54685, 109370, 218740, 1060889, 2121778, 4243556, 5304445, 10608890, 21217780]

約数ペア:

[(1, 21217780), (2, 10608890), (4, 5304445), (5, 4243556), (10, 2121778), (20, 1060889), (97, 218740), (194, 109370), (388, 54685), (485, 43748), (970, 21874), (1940, 10937)]