20398280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{263}}^1\times {\mathrm{277}}^1$

素因数の和:558

約数の個数: 64

約数和(自身を含む): 52842240

約数和(自身を除く): 32443960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 263, 277, 280, 526, 554, 1052, 1108, 1315, 1385, 1841, 1939, 2104, 2216, 2630, 2770, 3682, 3878, 5260, 5540, 7364, 7756, 9205, 9695, 10520, 11080, 14728, 15512, 18410, 19390, 36820, 38780, 72851, 73640, 77560, 145702, 291404, 364255, 509957, 582808, 728510, 1019914, 1457020, 2039828, 2549785, 2914040, 4079656, 5099570, 10199140, 20398280]

約数ペア:

[(1, 20398280), (2, 10199140), (4, 5099570), (5, 4079656), (7, 2914040), (8, 2549785), (10, 2039828), (14, 1457020), (20, 1019914), (28, 728510), (35, 582808), (40, 509957), (56, 364255), (70, 291404), (140, 145702), (263, 77560), (277, 73640), (280, 72851), (526, 38780), (554, 36820), (1052, 19390), (1108, 18410), (1315, 15512), (1385, 14728), (1841, 11080), (1939, 10520), (2104, 9695), (2216, 9205), (2630, 7756), (2770, 7364), (3682, 5540), (3878, 5260)]