20487940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{4049}}^1$

素因数の和:4092

約数の個数: 48

約数和(自身を含む): 48988800

約数和(自身を除く): 28500860

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 23, 44, 46, 55, 92, 110, 115, 220, 230, 253, 460, 506, 1012, 1265, 2530, 4049, 5060, 8098, 16196, 20245, 40490, 44539, 80980, 89078, 93127, 178156, 186254, 222695, 372508, 445390, 465635, 890780, 931270, 1024397, 1862540, 2048794, 4097588, 5121985, 10243970, 20487940]

約数ペア:

[(1, 20487940), (2, 10243970), (4, 5121985), (5, 4097588), (10, 2048794), (11, 1862540), (20, 1024397), (22, 931270), (23, 890780), (44, 465635), (46, 445390), (55, 372508), (92, 222695), (110, 186254), (115, 178156), (220, 93127), (230, 89078), (253, 80980), (460, 44539), (506, 40490), (1012, 20245), (1265, 16196), (2530, 8098), (4049, 5060)]