21691719

素因数分解:

$3^4\times 7^1\times {\mathrm{67}}^1\times {\mathrm{571}}^1$

素因数の和:657

約数の個数: 40

約数和(自身を含む): 37651328

約数和(自身を除く): 15959609

約数列:

[1, 3, 7, 9, 21, 27, 63, 67, 81, 189, 201, 469, 567, 571, 603, 1407, 1713, 1809, 3997, 4221, 5139, 5427, 11991, 12663, 15417, 35973, 37989, 38257, 46251, 107919, 114771, 267799, 323757, 344313, 803397, 1032939, 2410191, 3098817, 7230573, 21691719]

約数ペア:

[(1, 21691719), (3, 7230573), (7, 3098817), (9, 2410191), (21, 1032939), (27, 803397), (63, 344313), (67, 323757), (81, 267799), (189, 114771), (201, 107919), (469, 46251), (567, 38257), (571, 37989), (603, 35973), (1407, 15417), (1713, 12663), (1809, 11991), (3997, 5427), (4221, 5139)]