20991303

素因数分解:

$3^2\times {\mathrm{41}}^1\times {\mathrm{163}}^1\times {\mathrm{349}}^1$

素因数の和:559

約数の個数: 24

約数和(自身を含む): 31340400

約数和(自身を除く): 10349097

約数列:

[1, 3, 9, 41, 123, 163, 349, 369, 489, 1047, 1467, 3141, 6683, 14309, 20049, 42927, 56887, 60147, 128781, 170661, 511983, 2332367, 6997101, 20991303]

約数ペア:

[(1, 20991303), (3, 6997101), (9, 2332367), (41, 511983), (123, 170661), (163, 128781), (349, 60147), (369, 56887), (489, 42927), (1047, 20049), (1467, 14309), (3141, 6683)]