20704509

素因数分解:

$3^2\times 7^3\times {\mathrm{19}}^1\times {\mathrm{353}}^1$

素因数の和:399

約数の個数: 48

約数和(自身を含む): 36816000

約数和(自身を除く): 16111491

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 343, 353, 399, 441, 931, 1029, 1059, 1197, 2471, 2793, 3087, 3177, 6517, 6707, 7413, 8379, 17297, 19551, 20121, 22239, 46949, 51891, 58653, 60363, 121079, 140847, 155673, 328643, 363237, 422541, 985929, 1089711, 2300501, 2957787, 6901503, 20704509]

約数ペア:

[(1, 20704509), (3, 6901503), (7, 2957787), (9, 2300501), (19, 1089711), (21, 985929), (49, 422541), (57, 363237), (63, 328643), (133, 155673), (147, 140847), (171, 121079), (343, 60363), (353, 58653), (399, 51891), (441, 46949), (931, 22239), (1029, 20121), (1059, 19551), (1197, 17297), (2471, 8379), (2793, 7413), (3087, 6707), (3177, 6517)]