18986980

素因数分解:

$2^2\times 5^1\times {\mathrm{443}}^1\times {\mathrm{2143}}^1$

素因数の和:2595

約数の個数: 24

約数和(自身を含む): 39981312

約数和(自身を除く): 20994332

約数列:

[1, 2, 4, 5, 10, 20, 443, 886, 1772, 2143, 2215, 4286, 4430, 8572, 8860, 10715, 21430, 42860, 949349, 1898698, 3797396, 4746745, 9493490, 18986980]

約数ペア:

[(1, 18986980), (2, 9493490), (4, 4746745), (5, 3797396), (10, 1898698), (20, 949349), (443, 42860), (886, 21430), (1772, 10715), (2143, 8860), (2215, 8572), (4286, 4430)]