21227913

素因数分解:

$3^4\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1291}}^1$

素因数の和:1339

約数の個数: 40

約数和(自身を含む): 37519680

約数和(自身を除く): 16291767

約数列:

[1, 3, 7, 9, 21, 27, 29, 63, 81, 87, 189, 203, 261, 567, 609, 783, 1291, 1827, 2349, 3873, 5481, 9037, 11619, 16443, 27111, 34857, 37439, 81333, 104571, 112317, 243999, 262073, 336951, 731997, 786219, 1010853, 2358657, 3032559, 7075971, 21227913]

約数ペア:

[(1, 21227913), (3, 7075971), (7, 3032559), (9, 2358657), (21, 1010853), (27, 786219), (29, 731997), (63, 336951), (81, 262073), (87, 243999), (189, 112317), (203, 104571), (261, 81333), (567, 37439), (609, 34857), (783, 27111), (1291, 16443), (1827, 11619), (2349, 9037), (3873, 5481)]