19801840

素因数分解:

$2^4\times 5^1\times {\mathrm{127}}^1\times {\mathrm{1949}}^1$

素因数の和:2089

約数の個数: 40

約数和(自身を含む): 46425600

約数和(自身を除く): 26623760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 127, 254, 508, 635, 1016, 1270, 1949, 2032, 2540, 3898, 5080, 7796, 9745, 10160, 15592, 19490, 31184, 38980, 77960, 155920, 247523, 495046, 990092, 1237615, 1980184, 2475230, 3960368, 4950460, 9900920, 19801840]

約数ペア:

[(1, 19801840), (2, 9900920), (4, 4950460), (5, 3960368), (8, 2475230), (10, 1980184), (16, 1237615), (20, 990092), (40, 495046), (80, 247523), (127, 155920), (254, 77960), (508, 38980), (635, 31184), (1016, 19490), (1270, 15592), (1949, 10160), (2032, 9745), (2540, 7796), (3898, 5080)]