21807988

素因数分解:

$2^2\times {\mathrm{61}}^1\times {\mathrm{139}}^1\times {\mathrm{643}}^1$

素因数の和:847

約数の個数: 24

約数和(自身を含む): 39129440

約数和(自身を除く): 17321452

約数列:

[1, 2, 4, 61, 122, 139, 244, 278, 556, 643, 1286, 2572, 8479, 16958, 33916, 39223, 78446, 89377, 156892, 178754, 357508, 5451997, 10903994, 21807988]

約数ペア:

[(1, 21807988), (2, 10903994), (4, 5451997), (61, 357508), (122, 178754), (139, 156892), (244, 89377), (278, 78446), (556, 39223), (643, 33916), (1286, 16958), (2572, 8479)]