20685980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{1063}}^1$

素因数の和:1218

約数の個数: 48

約数和(自身を含む): 50050560

約数和(自身を除く): 29364580

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 139, 140, 278, 556, 695, 973, 1063, 1390, 1946, 2126, 2780, 3892, 4252, 4865, 5315, 7441, 9730, 10630, 14882, 19460, 21260, 29764, 37205, 74410, 147757, 148820, 295514, 591028, 738785, 1034299, 1477570, 2068598, 2955140, 4137196, 5171495, 10342990, 20685980]

約数ペア:

[(1, 20685980), (2, 10342990), (4, 5171495), (5, 4137196), (7, 2955140), (10, 2068598), (14, 1477570), (20, 1034299), (28, 738785), (35, 591028), (70, 295514), (139, 148820), (140, 147757), (278, 74410), (556, 37205), (695, 29764), (973, 21260), (1063, 19460), (1390, 14882), (1946, 10630), (2126, 9730), (2780, 7441), (3892, 5315), (4252, 4865)]