21297155

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12491}}^1$

素因数の和:12538

約数の個数: 16

約数和(自身を含む): 28781568

約数和(自身を除く): 7484413

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12491, 62455, 137401, 387221, 687005, 1936105, 4259431, 21297155]

約数ペア:

[(1, 21297155), (5, 4259431), (11, 1936105), (31, 687005), (55, 387221), (155, 137401), (341, 62455), (1705, 12491)]