21540475

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1$

素因数の和:160

約数の個数: 48

約数和(自身を含む): 31381920

約数和(自身を除く): 9841445

約数列:

[1, 5, 11, 25, 29, 37, 55, 73, 145, 185, 275, 319, 365, 407, 725, 803, 925, 1073, 1595, 1825, 2035, 2117, 2701, 4015, 5365, 7975, 10175, 10585, 11803, 13505, 20075, 23287, 26825, 29711, 52925, 59015, 67525, 78329, 116435, 148555, 295075, 391645, 582175, 742775, 861619, 1958225, 4308095, 21540475]

約数ペア:

[(1, 21540475), (5, 4308095), (11, 1958225), (25, 861619), (29, 742775), (37, 582175), (55, 391645), (73, 295075), (145, 148555), (185, 116435), (275, 78329), (319, 67525), (365, 59015), (407, 52925), (725, 29711), (803, 26825), (925, 23287), (1073, 20075), (1595, 13505), (1825, 11803), (2035, 10585), (2117, 10175), (2701, 7975), (4015, 5365)]