21013559

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{2777}}^1$

素因数の和:2854

約数の個数: 16

約数和(自身を含む): 25602048

約数和(自身を除く): 4588489

約数列:

[1, 7, 23, 47, 161, 329, 1081, 2777, 7567, 19439, 63871, 130519, 447097, 913633, 3001937, 21013559]

約数ペア:

[(1, 21013559), (7, 3001937), (23, 913633), (47, 447097), (161, 130519), (329, 63871), (1081, 19439), (2777, 7567)]