21657951

素因数分解:

$3^2\times 7^2\times {\mathrm{67}}^1\times {\mathrm{733}}^1$

素因数の和:820

約数の個数: 36

約数和(自身を含む): 36984792

約数和(自身を除く): 15326841

約数列:

[1, 3, 7, 9, 21, 49, 63, 67, 147, 201, 441, 469, 603, 733, 1407, 2199, 3283, 4221, 5131, 6597, 9849, 15393, 29547, 35917, 46179, 49111, 107751, 147333, 323253, 343777, 441999, 1031331, 2406439, 3093993, 7219317, 21657951]

約数ペア:

[(1, 21657951), (3, 7219317), (7, 3093993), (9, 2406439), (21, 1031331), (49, 441999), (63, 343777), (67, 323253), (147, 147333), (201, 107751), (441, 49111), (469, 46179), (603, 35917), (733, 29547), (1407, 15393), (2199, 9849), (3283, 6597), (4221, 5131)]