21165880

素因数分解:

$2^3\times 5^1\times {\mathrm{353}}^1\times {\mathrm{1499}}^1$

素因数の和:1863

約数の個数: 32

約数和(自身を含む): 47790000

約数和(自身を除く): 26624120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 353, 706, 1412, 1499, 1765, 2824, 2998, 3530, 5996, 7060, 7495, 11992, 14120, 14990, 29980, 59960, 529147, 1058294, 2116588, 2645735, 4233176, 5291470, 10582940, 21165880]

約数ペア:

[(1, 21165880), (2, 10582940), (4, 5291470), (5, 4233176), (8, 2645735), (10, 2116588), (20, 1058294), (40, 529147), (353, 59960), (706, 29980), (1412, 14990), (1499, 14120), (1765, 11992), (2824, 7495), (2998, 7060), (3530, 5996)]