21382520

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1307}}^1$

素因数の和:1727

約数の個数: 32

約数和(自身を含む): 48265200

約数和(自身を除く): 26882680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1307, 1636, 2045, 2614, 3272, 4090, 5228, 6535, 8180, 10456, 13070, 16360, 26140, 52280, 534563, 1069126, 2138252, 2672815, 4276504, 5345630, 10691260, 21382520]

約数ペア:

[(1, 21382520), (2, 10691260), (4, 5345630), (5, 4276504), (8, 2672815), (10, 2138252), (20, 1069126), (40, 534563), (409, 52280), (818, 26140), (1307, 16360), (1636, 13070), (2045, 10456), (2614, 8180), (3272, 6535), (4090, 5228)]