20987901

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{2099}}^1$

素因数の和:2217

約数の個数: 24

約数和(自身を含む): 33415200

約数和(自身を除く): 12427299

約数列:

[1, 3, 9, 11, 33, 99, 101, 303, 909, 1111, 2099, 3333, 6297, 9999, 18891, 23089, 69267, 207801, 211999, 635997, 1907991, 2331989, 6995967, 20987901]

約数ペア:

[(1, 20987901), (3, 6995967), (9, 2331989), (11, 1907991), (33, 635997), (99, 211999), (101, 207801), (303, 69267), (909, 23089), (1111, 18891), (2099, 9999), (3333, 6297)]