21139940

素因数分解:

$2^2\times 5^1\times {\mathrm{263}}^1\times {\mathrm{4019}}^1$

素因数の和:4291

約数の個数: 24

約数和(自身を含む): 44573760

約数和(自身を除く): 23433820

約数列:

[1, 2, 4, 5, 10, 20, 263, 526, 1052, 1315, 2630, 4019, 5260, 8038, 16076, 20095, 40190, 80380, 1056997, 2113994, 4227988, 5284985, 10569970, 21139940]

約数ペア:

[(1, 21139940), (2, 10569970), (4, 5284985), (5, 4227988), (10, 2113994), (20, 1056997), (263, 80380), (526, 40190), (1052, 20095), (1315, 16076), (2630, 8038), (4019, 5260)]