21345820

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{11003}}^1$

素因数の和:11109

約数の個数: 24

約数和(自身を含む): 45292464

約数和(自身を除く): 23946644

約数列:

[1, 2, 4, 5, 10, 20, 97, 194, 388, 485, 970, 1940, 11003, 22006, 44012, 55015, 110030, 220060, 1067291, 2134582, 4269164, 5336455, 10672910, 21345820]

約数ペア:

[(1, 21345820), (2, 10672910), (4, 5336455), (5, 4269164), (10, 2134582), (20, 1067291), (97, 220060), (194, 110030), (388, 55015), (485, 44012), (970, 22006), (1940, 11003)]