21612680

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1361}}^1$

素因数の和:1769

約数の個数: 32

約数和(自身を含む): 48786840

約数和(自身を除く): 27174160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1361, 1588, 1985, 2722, 3176, 3970, 5444, 6805, 7940, 10888, 13610, 15880, 27220, 54440, 540317, 1080634, 2161268, 2701585, 4322536, 5403170, 10806340, 21612680]

約数ペア:

[(1, 21612680), (2, 10806340), (4, 5403170), (5, 4322536), (8, 2701585), (10, 2161268), (20, 1080634), (40, 540317), (397, 54440), (794, 27220), (1361, 15880), (1588, 13610), (1985, 10888), (2722, 7940), (3176, 6805), (3970, 5444)]