21015688

素因数分解:

$2^3\times {\mathrm{139}}^1\times {\mathrm{18899}}^1$

素因数の和:19044

約数の個数: 16

約数和(自身を含む): 39690000

約数和(自身を除く): 18674312

約数列:

[1, 2, 4, 8, 139, 278, 556, 1112, 18899, 37798, 75596, 151192, 2626961, 5253922, 10507844, 21015688]

約数ペア:

[(1, 21015688), (2, 10507844), (4, 5253922), (8, 2626961), (139, 151192), (278, 75596), (556, 37798), (1112, 18899)]