21131480

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{223}}^1$

素因数の和:360

約数の個数: 64

約数和(自身を含む): 50319360

約数和(自身を除く): 29187880

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 103, 115, 184, 206, 223, 230, 412, 446, 460, 515, 824, 892, 920, 1030, 1115, 1784, 2060, 2230, 2369, 4120, 4460, 4738, 5129, 8920, 9476, 10258, 11845, 18952, 20516, 22969, 23690, 25645, 41032, 45938, 47380, 51290, 91876, 94760, 102580, 114845, 183752, 205160, 229690, 459380, 528287, 918760, 1056574, 2113148, 2641435, 4226296, 5282870, 10565740, 21131480]

約数ペア:

[(1, 21131480), (2, 10565740), (4, 5282870), (5, 4226296), (8, 2641435), (10, 2113148), (20, 1056574), (23, 918760), (40, 528287), (46, 459380), (92, 229690), (103, 205160), (115, 183752), (184, 114845), (206, 102580), (223, 94760), (230, 91876), (412, 51290), (446, 47380), (460, 45938), (515, 41032), (824, 25645), (892, 23690), (920, 22969), (1030, 20516), (1115, 18952), (1784, 11845), (2060, 10258), (2230, 9476), (2369, 8920), (4120, 5129), (4460, 4738)]