21067520

素因数分解:

$2^8\times 5^1\times {\mathrm{109}}^1\times {\mathrm{151}}^1$

素因数の和:281

約数の個数: 72

約数和(自身を含む): 51263520

約数和(自身を除く): 30196000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 109, 128, 151, 160, 218, 256, 302, 320, 436, 545, 604, 640, 755, 872, 1090, 1208, 1280, 1510, 1744, 2180, 2416, 3020, 3488, 4360, 4832, 6040, 6976, 8720, 9664, 12080, 13952, 16459, 17440, 19328, 24160, 27904, 32918, 34880, 38656, 48320, 65836, 69760, 82295, 96640, 131672, 139520, 164590, 193280, 263344, 329180, 526688, 658360, 1053376, 1316720, 2106752, 2633440, 4213504, 5266880, 10533760, 21067520]

約数ペア:

[(1, 21067520), (2, 10533760), (4, 5266880), (5, 4213504), (8, 2633440), (10, 2106752), (16, 1316720), (20, 1053376), (32, 658360), (40, 526688), (64, 329180), (80, 263344), (109, 193280), (128, 164590), (151, 139520), (160, 131672), (218, 96640), (256, 82295), (302, 69760), (320, 65836), (436, 48320), (545, 38656), (604, 34880), (640, 32918), (755, 27904), (872, 24160), (1090, 19328), (1208, 17440), (1280, 16459), (1510, 13952), (1744, 12080), (2180, 9664), (2416, 8720), (3020, 6976), (3488, 6040), (4360, 4832)]