21257397

素因数分解:

$3^5\times 7^1\times {\mathrm{12497}}^1$

素因数の和:12519

約数の個数: 24

約数和(自身を含む): 36394176

約数和(自身を除く): 15136779

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 1701, 12497, 37491, 87479, 112473, 262437, 337419, 787311, 1012257, 2361933, 3036771, 7085799, 21257397]

約数ペア:

[(1, 21257397), (3, 7085799), (7, 3036771), (9, 2361933), (21, 1012257), (27, 787311), (63, 337419), (81, 262437), (189, 112473), (243, 87479), (567, 37491), (1701, 12497)]