21270440

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{827}}^1$

素因数の和:1481

約数の個数: 32

約数和(自身を含む): 47990880

約数和(自身を除く): 26720440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 827, 1286, 1654, 2572, 3215, 3308, 4135, 5144, 6430, 6616, 8270, 12860, 16540, 25720, 33080, 531761, 1063522, 2127044, 2658805, 4254088, 5317610, 10635220, 21270440]

約数ペア:

[(1, 21270440), (2, 10635220), (4, 5317610), (5, 4254088), (8, 2658805), (10, 2127044), (20, 1063522), (40, 531761), (643, 33080), (827, 25720), (1286, 16540), (1654, 12860), (2572, 8270), (3215, 6616), (3308, 6430), (4135, 5144)]