20987860

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61729}}^1$

素因数の和:61755

約数の個数: 24

約数和(自身を含む): 46667880

約数和(自身を除く): 25680020

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 61729, 123458, 246916, 308645, 617290, 1049393, 1234580, 2098786, 4197572, 5246965, 10493930, 20987860]

約数ペア:

[(1, 20987860), (2, 10493930), (4, 5246965), (5, 4197572), (10, 2098786), (17, 1234580), (20, 1049393), (34, 617290), (68, 308645), (85, 246916), (170, 123458), (340, 61729)]