21258640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20441}}^1$

素因数の和:20467

約数の個数: 40

約数和(自身を含む): 53230968

約数和(自身を除く): 31972328

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20441, 40882, 81764, 102205, 163528, 204410, 265733, 327056, 408820, 531466, 817640, 1062932, 1328665, 1635280, 2125864, 2657330, 4251728, 5314660, 10629320, 21258640]

約数ペア:

[(1, 21258640), (2, 10629320), (4, 5314660), (5, 4251728), (8, 2657330), (10, 2125864), (13, 1635280), (16, 1328665), (20, 1062932), (26, 817640), (40, 531466), (52, 408820), (65, 327056), (80, 265733), (104, 204410), (130, 163528), (208, 102205), (260, 81764), (520, 40882), (1040, 20441)]