21250400

素因数分解:

$2^5\times 5^2\times {\mathrm{101}}^1\times {\mathrm{263}}^1$

素因数の和:384

約数の個数: 72

約数和(自身を含む): 52590384

約数和(自身を除く): 31339984

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 101, 160, 200, 202, 263, 400, 404, 505, 526, 800, 808, 1010, 1052, 1315, 1616, 2020, 2104, 2525, 2630, 3232, 4040, 4208, 5050, 5260, 6575, 8080, 8416, 10100, 10520, 13150, 16160, 20200, 21040, 26300, 26563, 40400, 42080, 52600, 53126, 80800, 105200, 106252, 132815, 210400, 212504, 265630, 425008, 531260, 664075, 850016, 1062520, 1328150, 2125040, 2656300, 4250080, 5312600, 10625200, 21250400]

約数ペア:

[(1, 21250400), (2, 10625200), (4, 5312600), (5, 4250080), (8, 2656300), (10, 2125040), (16, 1328150), (20, 1062520), (25, 850016), (32, 664075), (40, 531260), (50, 425008), (80, 265630), (100, 212504), (101, 210400), (160, 132815), (200, 106252), (202, 105200), (263, 80800), (400, 53126), (404, 52600), (505, 42080), (526, 40400), (800, 26563), (808, 26300), (1010, 21040), (1052, 20200), (1315, 16160), (1616, 13150), (2020, 10520), (2104, 10100), (2525, 8416), (2630, 8080), (3232, 6575), (4040, 5260), (4208, 5050)]