18978817

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{211}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 24361344

約数和(自身を除く): 5382527

約数列:

[1, 11, 13, 17, 37, 143, 187, 211, 221, 407, 481, 629, 2321, 2431, 2743, 3587, 5291, 6919, 7807, 8177, 30173, 39457, 46631, 85877, 89947, 101491, 132719, 512941, 1116401, 1459909, 1725347, 18978817]

約数ペア:

[(1, 18978817), (11, 1725347), (13, 1459909), (17, 1116401), (37, 512941), (143, 132719), (187, 101491), (211, 89947), (221, 85877), (407, 46631), (481, 39457), (629, 30173), (2321, 8177), (2431, 7807), (2743, 6919), (3587, 5291)]