21810987

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1$

素因数の和:224

約数の個数: 48

約数和(自身を含む): 36391680

約数和(自身を除く): 14580693

約数列:

[1, 3, 9, 11, 29, 33, 71, 87, 99, 107, 213, 261, 319, 321, 639, 781, 957, 963, 1177, 2059, 2343, 2871, 3103, 3531, 6177, 7029, 7597, 9309, 10593, 18531, 22649, 22791, 27927, 34133, 67947, 68373, 83567, 102399, 203841, 220313, 250701, 307197, 660939, 752103, 1982817, 2423443, 7270329, 21810987]

約数ペア:

[(1, 21810987), (3, 7270329), (9, 2423443), (11, 1982817), (29, 752103), (33, 660939), (71, 307197), (87, 250701), (99, 220313), (107, 203841), (213, 102399), (261, 83567), (319, 68373), (321, 67947), (639, 34133), (781, 27927), (957, 22791), (963, 22649), (1177, 18531), (2059, 10593), (2343, 9309), (2871, 7597), (3103, 7029), (3531, 6177)]