20989556

素因数分解:

$2^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{5393}}^1$

素因数の和:5543

約数の個数: 24

約数和(自身を含む): 42288960

約数和(自身を除く): 21299404

約数列:

[1, 2, 4, 7, 14, 28, 139, 278, 556, 973, 1946, 3892, 5393, 10786, 21572, 37751, 75502, 151004, 749627, 1499254, 2998508, 5247389, 10494778, 20989556]

約数ペア:

[(1, 20989556), (2, 10494778), (4, 5247389), (7, 2998508), (14, 1499254), (28, 749627), (139, 151004), (278, 75502), (556, 37751), (973, 21572), (1946, 10786), (3892, 5393)]