19961981

素因数分解:

${\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{883}}^1$

素因数の和:980

約数の個数: 16

約数和(自身を含む): 22573824

約数和(自身を除く): 2611843

約数列:

[1, 13, 37, 47, 481, 611, 883, 1739, 11479, 22607, 32671, 41501, 424723, 539513, 1535537, 19961981]

約数ペア:

[(1, 19961981), (13, 1535537), (37, 539513), (47, 424723), (481, 41501), (611, 32671), (883, 22607), (1739, 11479)]