20983221

素因数分解:

$3^2\times 7^2\times {\mathrm{47581}}^1$

素因数の和:47601

約数の個数: 18

約数和(自身を含む): 35258262

約数和(自身を除く): 14275041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 47581, 142743, 333067, 428229, 999201, 2331469, 2997603, 6994407, 20983221]

約数ペア:

[(1, 20983221), (3, 6994407), (7, 2997603), (9, 2331469), (21, 999201), (49, 428229), (63, 333067), (147, 142743), (441, 47581)]