21078981

素因数分解:

$3^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{10139}}^1$

素因数の和:10166

約数の個数: 32

約数和(自身を含む): 38937600

約数和(自身を除く): 17858619

約数列:

[1, 3, 7, 9, 11, 21, 27, 33, 63, 77, 99, 189, 231, 297, 693, 2079, 10139, 30417, 70973, 91251, 111529, 212919, 273753, 334587, 638757, 780703, 1003761, 1916271, 2342109, 3011283, 7026327, 21078981]

約数ペア:

[(1, 21078981), (3, 7026327), (7, 3011283), (9, 2342109), (11, 1916271), (21, 1003761), (27, 780703), (33, 638757), (63, 334587), (77, 273753), (99, 212919), (189, 111529), (231, 91251), (297, 70973), (693, 30417), (2079, 10139)]