21406973

素因数分解:

$7^3\times {\mathrm{139}}^1\times {\mathrm{449}}^1$

素因数の和:609

約数の個数: 16

約数和(自身を含む): 25200000

約数和(自身を除く): 3793027

約数列:

[1, 7, 49, 139, 343, 449, 973, 3143, 6811, 22001, 47677, 62411, 154007, 436877, 3058139, 21406973]

約数ペア:

[(1, 21406973), (7, 3058139), (49, 436877), (139, 154007), (343, 62411), (449, 47677), (973, 22001), (3143, 6811)]