21996865

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 30108672

約数和(自身を除く): 8111807

約数列:

[1, 5, 11, 43, 55, 71, 131, 215, 355, 473, 655, 781, 1441, 2365, 3053, 3905, 5633, 7205, 9301, 15265, 28165, 33583, 46505, 61963, 102311, 167915, 309815, 399943, 511555, 1999715, 4399373, 21996865]

約数ペア:

[(1, 21996865), (5, 4399373), (11, 1999715), (43, 511555), (55, 399943), (71, 309815), (131, 167915), (215, 102311), (355, 61963), (473, 46505), (655, 33583), (781, 28165), (1441, 15265), (2365, 9301), (3053, 7205), (3905, 5633)]