21339820

素因数分解:

$2^2\times 5^1\times {\mathrm{263}}^1\times {\mathrm{4057}}^1$

素因数の和:4329

約数の個数: 24

約数和(自身を含む): 44995104

約数和(自身を除く): 23655284

約数列:

[1, 2, 4, 5, 10, 20, 263, 526, 1052, 1315, 2630, 4057, 5260, 8114, 16228, 20285, 40570, 81140, 1066991, 2133982, 4267964, 5334955, 10669910, 21339820]

約数ペア:

[(1, 21339820), (2, 10669910), (4, 5334955), (5, 4267964), (10, 2133982), (20, 1066991), (263, 81140), (526, 40570), (1052, 20285), (1315, 16228), (2630, 8114), (4057, 5260)]