20520969

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{51431}}^1$

素因数の和:51460

約数の個数: 16

約数和(自身を含む): 32916480

約数和(自身を除く): 12395511

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 51431, 154293, 360017, 977189, 1080051, 2931567, 6840323, 20520969]

約数ペア:

[(1, 20520969), (3, 6840323), (7, 2931567), (19, 1080051), (21, 977189), (57, 360017), (133, 154293), (399, 51431)]