21139960

素因数分解:

$2^3\times 5^1\times {\mathrm{443}}^1\times {\mathrm{1193}}^1$

素因数の和:1647

約数の個数: 32

約数和(自身を含む): 47712240

約数和(自身を除く): 26572280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 443, 886, 1193, 1772, 2215, 2386, 3544, 4430, 4772, 5965, 8860, 9544, 11930, 17720, 23860, 47720, 528499, 1056998, 2113996, 2642495, 4227992, 5284990, 10569980, 21139960]

約数ペア:

[(1, 21139960), (2, 10569980), (4, 5284990), (5, 4227992), (8, 2642495), (10, 2113996), (20, 1056998), (40, 528499), (443, 47720), (886, 23860), (1193, 17720), (1772, 11930), (2215, 9544), (2386, 8860), (3544, 5965), (4430, 4772)]