20997711

素因数分解:

$3^4\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1277}}^1$

素因数の和:1325

約数の個数: 40

約数和(自身を含む): 37113120

約数和(自身を除く): 16115409

約数列:

[1, 3, 7, 9, 21, 27, 29, 63, 81, 87, 189, 203, 261, 567, 609, 783, 1277, 1827, 2349, 3831, 5481, 8939, 11493, 16443, 26817, 34479, 37033, 80451, 103437, 111099, 241353, 259231, 333297, 724059, 777693, 999891, 2333079, 2999673, 6999237, 20997711]

約数ペア:

[(1, 20997711), (3, 6999237), (7, 2999673), (9, 2333079), (21, 999891), (27, 777693), (29, 724059), (63, 333297), (81, 259231), (87, 241353), (189, 111099), (203, 103437), (261, 80451), (567, 37033), (609, 34479), (783, 26817), (1277, 16443), (1827, 11493), (2349, 8939), (3831, 5481)]