21052880

素因数分解:

$2^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{2713}}^1$

素因数の和:2823

約数の個数: 40

約数和(自身を含む): 49470792

約数和(自身を除く): 28417912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 2713, 3880, 5426, 7760, 10852, 13565, 21704, 27130, 43408, 54260, 108520, 217040, 263161, 526322, 1052644, 1315805, 2105288, 2631610, 4210576, 5263220, 10526440, 21052880]

約数ペア:

[(1, 21052880), (2, 10526440), (4, 5263220), (5, 4210576), (8, 2631610), (10, 2105288), (16, 1315805), (20, 1052644), (40, 526322), (80, 263161), (97, 217040), (194, 108520), (388, 54260), (485, 43408), (776, 27130), (970, 21704), (1552, 13565), (1940, 10852), (2713, 7760), (3880, 5426)]