20991656

素因数分解:

$2^3\times 7^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{181}}^1$

素因数の和:322

約数の個数: 64

約数和(自身を含む): 48048000

約数和(自身を除く): 27056344

約数列:

[1, 2, 4, 7, 8, 14, 19, 28, 38, 56, 76, 109, 133, 152, 181, 218, 266, 362, 436, 532, 724, 763, 872, 1064, 1267, 1448, 1526, 2071, 2534, 3052, 3439, 4142, 5068, 6104, 6878, 8284, 10136, 13756, 14497, 16568, 19729, 24073, 27512, 28994, 39458, 48146, 57988, 78916, 96292, 115976, 138103, 157832, 192584, 276206, 374851, 552412, 749702, 1104824, 1499404, 2623957, 2998808, 5247914, 10495828, 20991656]

約数ペア:

[(1, 20991656), (2, 10495828), (4, 5247914), (7, 2998808), (8, 2623957), (14, 1499404), (19, 1104824), (28, 749702), (38, 552412), (56, 374851), (76, 276206), (109, 192584), (133, 157832), (152, 138103), (181, 115976), (218, 96292), (266, 78916), (362, 57988), (436, 48146), (532, 39458), (724, 28994), (763, 27512), (872, 24073), (1064, 19729), (1267, 16568), (1448, 14497), (1526, 13756), (2071, 10136), (2534, 8284), (3052, 6878), (3439, 6104), (4142, 5068)]