21000643175

素因数分解:

$5^2\times {\mathrm{10909}}^1\times {\mathrm{77003}}^1$

素因数の和:87922

約数の個数: 12

約数和(自身を含む): 26043522840

約数和(自身を除く): 5042879665

約数列:

[1, 5, 25, 10909, 54545, 77003, 272725, 385015, 1925075, 840025727, 4200128635, 21000643175]

約数ペア:

[(1, 21000643175), (5, 4200128635), (25, 840025727), (10909, 1925075), (54545, 385015), (77003, 272725)]