21013540

素因数分解:

$2^2\times 5^1\times {\mathrm{653}}^1\times {\mathrm{1609}}^1$

素因数の和:2271

約数の個数: 24

約数和(自身を含む): 44223480

約数和(自身を除く): 23209940

約数列:

[1, 2, 4, 5, 10, 20, 653, 1306, 1609, 2612, 3218, 3265, 6436, 6530, 8045, 13060, 16090, 32180, 1050677, 2101354, 4202708, 5253385, 10506770, 21013540]

約数ペア:

[(1, 21013540), (2, 10506770), (4, 5253385), (5, 4202708), (10, 2101354), (20, 1050677), (653, 32180), (1306, 16090), (1609, 13060), (2612, 8045), (3218, 6530), (3265, 6436)]