20392880

素因数分解:

$2^4\times 5^1\times {\mathrm{254911}}^1$

素因数の和:254924

約数の個数: 20

約数和(自身を含む): 47413632

約数和(自身を除く): 27020752

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 254911, 509822, 1019644, 1274555, 2039288, 2549110, 4078576, 5098220, 10196440, 20392880]

約数ペア:

[(1, 20392880), (2, 10196440), (4, 5098220), (5, 4078576), (8, 2549110), (10, 2039288), (16, 1274555), (20, 1019644), (40, 509822), (80, 254911)]