21337240

素因数分解:

$2^3\times 5^1\times {\mathrm{499}}^1\times {\mathrm{1069}}^1$

素因数の和:1579

約数の個数: 32

約数和(自身を含む): 48150000

約数和(自身を除く): 26812760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499, 998, 1069, 1996, 2138, 2495, 3992, 4276, 4990, 5345, 8552, 9980, 10690, 19960, 21380, 42760, 533431, 1066862, 2133724, 2667155, 4267448, 5334310, 10668620, 21337240]

約数ペア:

[(1, 21337240), (2, 10668620), (4, 5334310), (5, 4267448), (8, 2667155), (10, 2133724), (20, 1066862), (40, 533431), (499, 42760), (998, 21380), (1069, 19960), (1996, 10690), (2138, 9980), (2495, 8552), (3992, 5345), (4276, 4990)]