20688549

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{2729}}^1$

素因数の和:2777

約数の個数: 24

約数和(自身を含む): 33284160

約数和(自身を除く): 12595611

約数列:

[1, 3, 7, 19, 21, 57, 133, 361, 399, 1083, 2527, 2729, 7581, 8187, 19103, 51851, 57309, 155553, 362957, 985169, 1088871, 2955507, 6896183, 20688549]

約数ペア:

[(1, 20688549), (3, 6896183), (7, 2955507), (19, 1088871), (21, 985169), (57, 362957), (133, 155553), (361, 57309), (399, 51851), (1083, 19103), (2527, 8187), (2729, 7581)]