21906381

素因数分解:

$3^1\times 7^3\times {\mathrm{61}}^1\times {\mathrm{349}}^1$

素因数の和:434

約数の個数: 32

約数和(自身を含む): 34720000

約数和(自身を除く): 12813619

約数列:

[1, 3, 7, 21, 49, 61, 147, 183, 343, 349, 427, 1029, 1047, 1281, 2443, 2989, 7329, 8967, 17101, 20923, 21289, 51303, 62769, 63867, 119707, 149023, 359121, 447069, 1043161, 3129483, 7302127, 21906381]

約数ペア:

[(1, 21906381), (3, 7302127), (7, 3129483), (21, 1043161), (49, 447069), (61, 359121), (147, 149023), (183, 119707), (343, 63867), (349, 62769), (427, 51303), (1029, 21289), (1047, 20923), (1281, 17101), (2443, 8967), (2989, 7329)]