20999097

素因数分解:

$3^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{2801}}^1$

素因数の和:2838

約数の個数: 36

約数和(自身を含む): 37373076

約数和(自身を除く): 16373979

約数列:

[1, 3, 7, 9, 17, 21, 49, 51, 63, 119, 147, 153, 357, 441, 833, 1071, 2499, 2801, 7497, 8403, 19607, 25209, 47617, 58821, 137249, 142851, 176463, 333319, 411747, 428553, 999957, 1235241, 2333233, 2999871, 6999699, 20999097]

約数ペア:

[(1, 20999097), (3, 6999699), (7, 2999871), (9, 2333233), (17, 1235241), (21, 999957), (49, 428553), (51, 411747), (63, 333319), (119, 176463), (147, 142851), (153, 137249), (357, 58821), (441, 47617), (833, 25209), (1071, 19607), (2499, 8403), (2801, 7497)]