20005209

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{18679}}^1$

素因数の和:18709

約数の個数: 24

約数和(自身を含む): 34968960

約数和(自身を除く): 14963751

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071, 18679, 56037, 130753, 168111, 317543, 392259, 952629, 1176777, 2222801, 2857887, 6668403, 20005209]

約数ペア:

[(1, 20005209), (3, 6668403), (7, 2857887), (9, 2222801), (17, 1176777), (21, 952629), (51, 392259), (63, 317543), (119, 168111), (153, 130753), (357, 56037), (1071, 18679)]