21181580

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{7963}}^1$

素因数の和:7998

約数の個数: 48

約数和(自身を含む): 53518080

約数和(自身を除く): 32336500

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 95, 133, 140, 190, 266, 380, 532, 665, 1330, 2660, 7963, 15926, 31852, 39815, 55741, 79630, 111482, 151297, 159260, 222964, 278705, 302594, 557410, 605188, 756485, 1059079, 1114820, 1512970, 2118158, 3025940, 4236316, 5295395, 10590790, 21181580]

約数ペア:

[(1, 21181580), (2, 10590790), (4, 5295395), (5, 4236316), (7, 3025940), (10, 2118158), (14, 1512970), (19, 1114820), (20, 1059079), (28, 756485), (35, 605188), (38, 557410), (70, 302594), (76, 278705), (95, 222964), (133, 159260), (140, 151297), (190, 111482), (266, 79630), (380, 55741), (532, 39815), (665, 31852), (1330, 15926), (2660, 7963)]