21978243

素因数分解:

$3^3\times 7^1\times {\mathrm{103}}^1\times {\mathrm{1129}}^1$

素因数の和:1248

約数の個数: 32

約数和(自身を含む): 37606400

約数和(自身を除く): 15628157

約数列:

[1, 3, 7, 9, 21, 27, 63, 103, 189, 309, 721, 927, 1129, 2163, 2781, 3387, 6489, 7903, 10161, 19467, 23709, 30483, 71127, 116287, 213381, 348861, 814009, 1046583, 2442027, 3139749, 7326081, 21978243]

約数ペア:

[(1, 21978243), (3, 7326081), (7, 3139749), (9, 2442027), (21, 1046583), (27, 814009), (63, 348861), (103, 213381), (189, 116287), (309, 71127), (721, 30483), (927, 23709), (1129, 19467), (2163, 10161), (2781, 7903), (3387, 6489)]