20859980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25439}}^1$

素因数の和:25489

約数の個数: 24

約数和(自身を含む): 44876160

約数和(自身を除く): 24016180

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25439, 50878, 101756, 127195, 254390, 508780, 1042999, 2085998, 4171996, 5214995, 10429990, 20859980]

約数ペア:

[(1, 20859980), (2, 10429990), (4, 5214995), (5, 4171996), (10, 2085998), (20, 1042999), (41, 508780), (82, 254390), (164, 127195), (205, 101756), (410, 50878), (820, 25439)]