18991120

素因数分解:

$2^4\times 5^1\times {\mathrm{277}}^1\times {\mathrm{857}}^1$

素因数の和:1147

約数の個数: 40

約数和(自身を含む): 44365464

約数和(自身を除く): 25374344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 277, 554, 857, 1108, 1385, 1714, 2216, 2770, 3428, 4285, 4432, 5540, 6856, 8570, 11080, 13712, 17140, 22160, 34280, 68560, 237389, 474778, 949556, 1186945, 1899112, 2373890, 3798224, 4747780, 9495560, 18991120]

約数ペア:

[(1, 18991120), (2, 9495560), (4, 4747780), (5, 3798224), (8, 2373890), (10, 1899112), (16, 1186945), (20, 949556), (40, 474778), (80, 237389), (277, 68560), (554, 34280), (857, 22160), (1108, 17140), (1385, 13712), (1714, 11080), (2216, 8570), (2770, 6856), (3428, 5540), (4285, 4432)]