21256960

素因数分解:

$2^8\times 5^1\times {\mathrm{16607}}^1$

素因数の和:16628

約数の個数: 36

約数和(自身を含む): 50920128

約数和(自身を除く): 29663168

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 16607, 33214, 66428, 83035, 132856, 166070, 265712, 332140, 531424, 664280, 1062848, 1328560, 2125696, 2657120, 4251392, 5314240, 10628480, 21256960]

約数ペア:

[(1, 21256960), (2, 10628480), (4, 5314240), (5, 4251392), (8, 2657120), (10, 2125696), (16, 1328560), (20, 1062848), (32, 664280), (40, 531424), (64, 332140), (80, 265712), (128, 166070), (160, 132856), (256, 83035), (320, 66428), (640, 33214), (1280, 16607)]