21780549

素因数分解:

$3^3\times 7^2\times {\mathrm{101}}^1\times {\mathrm{163}}^1$

素因数の和:287

約数の個数: 48

約数和(自身を含む): 38139840

約数和(自身を除く): 16359291

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 101, 147, 163, 189, 303, 441, 489, 707, 909, 1141, 1323, 1467, 2121, 2727, 3423, 4401, 4949, 6363, 7987, 10269, 14847, 16463, 19089, 23961, 30807, 44541, 49389, 71883, 115241, 133623, 148167, 215649, 345723, 444501, 806687, 1037169, 2420061, 3111507, 7260183, 21780549]

約数ペア:

[(1, 21780549), (3, 7260183), (7, 3111507), (9, 2420061), (21, 1037169), (27, 806687), (49, 444501), (63, 345723), (101, 215649), (147, 148167), (163, 133623), (189, 115241), (303, 71883), (441, 49389), (489, 44541), (707, 30807), (909, 23961), (1141, 19089), (1323, 16463), (1467, 14847), (2121, 10269), (2727, 7987), (3423, 6363), (4401, 4949)]