20887911

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{2089}}^1$

素因数の和:2207

約数の個数: 24

約数和(自身を含む): 33256080

約数和(自身を除く): 12368169

約数列:

[1, 3, 9, 11, 33, 99, 101, 303, 909, 1111, 2089, 3333, 6267, 9999, 18801, 22979, 68937, 206811, 210989, 632967, 1898901, 2320879, 6962637, 20887911]

約数ペア:

[(1, 20887911), (3, 6962637), (9, 2320879), (11, 1898901), (33, 632967), (99, 210989), (101, 206811), (303, 68937), (909, 22979), (1111, 18801), (2089, 9999), (3333, 6267)]