21087781

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1$

素因数の和:193

約数の個数: 32

約数和(自身を含む): 26320896

約数和(自身を除く): 5233115

約数列:

[1, 11, 13, 31, 67, 71, 143, 341, 403, 737, 781, 871, 923, 2077, 2201, 4433, 4757, 9581, 10153, 22847, 24211, 27001, 28613, 52327, 61841, 147467, 297011, 314743, 680251, 1622137, 1917071, 21087781]

約数ペア:

[(1, 21087781), (11, 1917071), (13, 1622137), (31, 680251), (67, 314743), (71, 297011), (143, 147467), (341, 61841), (403, 52327), (737, 28613), (781, 27001), (871, 24211), (923, 22847), (2077, 10153), (2201, 9581), (4433, 4757)]