21253990

素因数分解:

$2^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{51839}}^1$

素因数の和:51887

約数の個数: 16

約数和(自身を含む): 39191040

約数和(自身を除く): 17937050

約数列:

[1, 2, 5, 10, 41, 82, 205, 410, 51839, 103678, 259195, 518390, 2125399, 4250798, 10626995, 21253990]

約数ペア:

[(1, 21253990), (2, 10626995), (5, 4250798), (10, 2125399), (41, 518390), (82, 259195), (205, 103678), (410, 51839)]