21581245

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{83}}^1$

素因数の和:154

約数の個数: 64

約数和(自身を含む): 34836480

約数和(自身を除く): 13255235

約数列:

[1, 5, 7, 17, 19, 23, 35, 83, 85, 95, 115, 119, 133, 161, 323, 391, 415, 437, 581, 595, 665, 805, 1411, 1577, 1615, 1909, 1955, 2185, 2261, 2737, 2905, 3059, 7055, 7429, 7885, 9545, 9877, 11039, 11305, 13363, 13685, 15295, 26809, 32453, 36271, 37145, 49385, 52003, 55195, 66815, 134045, 162265, 181355, 187663, 227171, 253897, 260015, 616607, 938315, 1135855, 1269485, 3083035, 4316249, 21581245]

約数ペア:

[(1, 21581245), (5, 4316249), (7, 3083035), (17, 1269485), (19, 1135855), (23, 938315), (35, 616607), (83, 260015), (85, 253897), (95, 227171), (115, 187663), (119, 181355), (133, 162265), (161, 134045), (323, 66815), (391, 55195), (415, 52003), (437, 49385), (581, 37145), (595, 36271), (665, 32453), (805, 26809), (1411, 15295), (1577, 13685), (1615, 13363), (1909, 11305), (1955, 11039), (2185, 9877), (2261, 9545), (2737, 7885), (2905, 7429), (3059, 7055)]