21751280

素因数分解:

$2^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{2803}}^1$

素因数の和:2913

約数の個数: 40

約数和(自身を含む): 51111312

約数和(自身を除く): 29360032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 2803, 3880, 5606, 7760, 11212, 14015, 22424, 28030, 44848, 56060, 112120, 224240, 271891, 543782, 1087564, 1359455, 2175128, 2718910, 4350256, 5437820, 10875640, 21751280]

約数ペア:

[(1, 21751280), (2, 10875640), (4, 5437820), (5, 4350256), (8, 2718910), (10, 2175128), (16, 1359455), (20, 1087564), (40, 543782), (80, 271891), (97, 224240), (194, 112120), (388, 56060), (485, 44848), (776, 28030), (970, 22424), (1552, 14015), (1940, 11212), (2803, 7760), (3880, 5606)]