20904860

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2687}}^1$

素因数の和:3085

約数の個数: 24

約数和(自身を含む): 44029440

約数和(自身を除く): 23124580

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2687, 3890, 5374, 7780, 10748, 13435, 26870, 53740, 1045243, 2090486, 4180972, 5226215, 10452430, 20904860]

約数ペア:

[(1, 20904860), (2, 10452430), (4, 5226215), (5, 4180972), (10, 2090486), (20, 1045243), (389, 53740), (778, 26870), (1556, 13435), (1945, 10748), (2687, 7780), (3890, 5374)]