19987880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{45427}}^1$

素因数の和:45449

約数の個数: 32

約数和(自身を含む): 49062240

約数和(自身を除く): 29074360

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440, 45427, 90854, 181708, 227135, 363416, 454270, 499697, 908540, 999394, 1817080, 1998788, 2498485, 3997576, 4996970, 9993940, 19987880]

約数ペア:

[(1, 19987880), (2, 9993940), (4, 4996970), (5, 3997576), (8, 2498485), (10, 1998788), (11, 1817080), (20, 999394), (22, 908540), (40, 499697), (44, 454270), (55, 363416), (88, 227135), (110, 181708), (220, 90854), (440, 45427)]