20989780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{313}}^1\times {\mathrm{479}}^1$

素因数の和:808

約数の個数: 48

約数和(自身を含む): 50641920

約数和(自身を除く): 29652140

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 313, 479, 626, 958, 1252, 1565, 1916, 2191, 2395, 3130, 3353, 4382, 4790, 6260, 6706, 8764, 9580, 10955, 13412, 16765, 21910, 33530, 43820, 67060, 149927, 299854, 599708, 749635, 1049489, 1499270, 2098978, 2998540, 4197956, 5247445, 10494890, 20989780]

約数ペア:

[(1, 20989780), (2, 10494890), (4, 5247445), (5, 4197956), (7, 2998540), (10, 2098978), (14, 1499270), (20, 1049489), (28, 749635), (35, 599708), (70, 299854), (140, 149927), (313, 67060), (479, 43820), (626, 33530), (958, 21910), (1252, 16765), (1565, 13412), (1916, 10955), (2191, 9580), (2395, 8764), (3130, 6706), (3353, 6260), (4382, 4790)]