19987809

素因数分解:

$3^1\times {\mathrm{61}}^1\times {\mathrm{239}}^1\times {\mathrm{457}}^1$

素因数の和:760

約数の個数: 16

約数和(自身を含む): 27260160

約数和(自身を除く): 7272351

約数列:

[1, 3, 61, 183, 239, 457, 717, 1371, 14579, 27877, 43737, 83631, 109223, 327669, 6662603, 19987809]

約数ペア:

[(1, 19987809), (3, 6662603), (61, 327669), (183, 109223), (239, 83631), (457, 43737), (717, 27877), (1371, 14579)]