21519980

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7741}}^1$

素因数の和:7889

約数の個数: 24

約数和(自身を含む): 45522960

約数和(自身を除く): 24002980

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7741, 15482, 30964, 38705, 77410, 154820, 1075999, 2151998, 4303996, 5379995, 10759990, 21519980]

約数ペア:

[(1, 21519980), (2, 10759990), (4, 5379995), (5, 4303996), (10, 2151998), (20, 1075999), (139, 154820), (278, 77410), (556, 38705), (695, 30964), (1390, 15482), (2780, 7741)]