21054520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12241}}^1$

素因数の和:12295

約数の個数: 32

約数和(自身を含む): 48478320

約数和(自身を除く): 27423800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12241, 24482, 48964, 61205, 97928, 122410, 244820, 489640, 526363, 1052726, 2105452, 2631815, 4210904, 5263630, 10527260, 21054520]

約数ペア:

[(1, 21054520), (2, 10527260), (4, 5263630), (5, 4210904), (8, 2631815), (10, 2105452), (20, 1052726), (40, 526363), (43, 489640), (86, 244820), (172, 122410), (215, 97928), (344, 61205), (430, 48964), (860, 24482), (1720, 12241)]