21240261

素因数分解:

$3^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{5527}}^1$

素因数の和:5601

約数の個数: 24

約数和(自身を含む): 35644544

約数和(自身を除く): 14404283

約数列:

[1, 3, 7, 9, 21, 61, 63, 183, 427, 549, 1281, 3843, 5527, 16581, 38689, 49743, 116067, 337147, 348201, 1011441, 2360029, 3034323, 7080087, 21240261]

約数ペア:

[(1, 21240261), (3, 7080087), (7, 3034323), (9, 2360029), (21, 1011441), (61, 348201), (63, 337147), (183, 116067), (427, 49743), (549, 38689), (1281, 16581), (3843, 5527)]