21538489

素因数分解:

$7^2\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1$

素因数の和:277

約数の個数: 24

約数和(自身を含む): 26199936

約数和(自身を除く): 4661447

約数列:

[1, 7, 41, 49, 71, 151, 287, 497, 1057, 2009, 2911, 3479, 6191, 7399, 10721, 20377, 43337, 75047, 142639, 303359, 439561, 525329, 3076927, 21538489]

約数ペア:

[(1, 21538489), (7, 3076927), (41, 525329), (49, 439561), (71, 303359), (151, 142639), (287, 75047), (497, 43337), (1057, 20377), (2009, 10721), (2911, 7399), (3479, 6191)]