19979560

素因数分解:

$2^3\times 5^1\times {\mathrm{307}}^1\times {\mathrm{1627}}^1$

素因数の和:1945

約数の個数: 32

約数和(自身を含む): 45128160

約数和(自身を除く): 25148600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 307, 614, 1228, 1535, 1627, 2456, 3070, 3254, 6140, 6508, 8135, 12280, 13016, 16270, 32540, 65080, 499489, 998978, 1997956, 2497445, 3995912, 4994890, 9989780, 19979560]

約数ペア:

[(1, 19979560), (2, 9989780), (4, 4994890), (5, 3995912), (8, 2497445), (10, 1997956), (20, 998978), (40, 499489), (307, 65080), (614, 32540), (1228, 16270), (1535, 13016), (1627, 12280), (2456, 8135), (3070, 6508), (3254, 6140)]