19981689

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1381}}^1$

素因数の和:1457

約数の個数: 32

約数和(自身を含む): 33433344

約数和(自身を除く): 13451655

約数列:

[1, 3, 7, 13, 21, 39, 53, 91, 159, 273, 371, 689, 1113, 1381, 2067, 4143, 4823, 9667, 14469, 17953, 29001, 53859, 73193, 125671, 219579, 377013, 512351, 951509, 1537053, 2854527, 6660563, 19981689]

約数ペア:

[(1, 19981689), (3, 6660563), (7, 2854527), (13, 1537053), (21, 951509), (39, 512351), (53, 377013), (91, 219579), (159, 125671), (273, 73193), (371, 53859), (689, 29001), (1113, 17953), (1381, 14469), (2067, 9667), (4143, 4823)]