19999371

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^2\times {\mathrm{991}}^1$

素因数の和:1063

約数の個数: 24

約数和(自身を含む): 31521792

約数和(自身を除く): 11522421

約数列:

[1, 3, 7, 21, 31, 93, 217, 651, 961, 991, 2883, 2973, 6727, 6937, 20181, 20811, 30721, 92163, 215047, 645141, 952351, 2857053, 6666457, 19999371]

約数ペア:

[(1, 19999371), (3, 6666457), (7, 2857053), (21, 952351), (31, 645141), (93, 215047), (217, 92163), (651, 30721), (961, 20811), (991, 20181), (2883, 6937), (2973, 6727)]