20999824

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{131}}^1\times {\mathrm{233}}^1$

素因数の和:415

約数の個数: 40

約数和(自身を含む): 42131232

約数和(自身を除く): 21131408

約数列:

[1, 2, 4, 8, 16, 43, 86, 131, 172, 233, 262, 344, 466, 524, 688, 932, 1048, 1864, 2096, 3728, 5633, 10019, 11266, 20038, 22532, 30523, 40076, 45064, 61046, 80152, 90128, 122092, 160304, 244184, 488368, 1312489, 2624978, 5249956, 10499912, 20999824]

約数ペア:

[(1, 20999824), (2, 10499912), (4, 5249956), (8, 2624978), (16, 1312489), (43, 488368), (86, 244184), (131, 160304), (172, 122092), (233, 90128), (262, 80152), (344, 61046), (466, 45064), (524, 40076), (688, 30523), (932, 22532), (1048, 20038), (1864, 11266), (2096, 10019), (3728, 5633)]