21076820

素因数分解:

$2^2\times 5^1\times {\mathrm{263}}^1\times {\mathrm{4007}}^1$

素因数の和:4279

約数の個数: 24

約数和(自身を含む): 44440704

約数和(自身を除く): 23363884

約数列:

[1, 2, 4, 5, 10, 20, 263, 526, 1052, 1315, 2630, 4007, 5260, 8014, 16028, 20035, 40070, 80140, 1053841, 2107682, 4215364, 5269205, 10538410, 21076820]

約数ペア:

[(1, 21076820), (2, 10538410), (4, 5269205), (5, 4215364), (10, 2107682), (20, 1053841), (263, 80140), (526, 40070), (1052, 20035), (1315, 16028), (2630, 8014), (4007, 5260)]