19725921

素因数分解:

$3^2\times {\mathrm{37}}^2\times {\mathrm{1601}}^1$

素因数の和:1681

約数の個数: 18

約数和(自身を含む): 29302182

約数和(自身を除く): 9576261

約数列:

[1, 3, 9, 37, 111, 333, 1369, 1601, 4107, 4803, 12321, 14409, 59237, 177711, 533133, 2191769, 6575307, 19725921]

約数ペア:

[(1, 19725921), (3, 6575307), (9, 2191769), (37, 533133), (111, 177711), (333, 59237), (1369, 14409), (1601, 12321), (4107, 4803)]