20489140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4721}}^1$

素因数の和:4768

約数の個数: 48

約数和(自身を含む): 50770944

約数和(自身を除く): 30281804

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4721, 9442, 18884, 23605, 33047, 47210, 66094, 94420, 132188, 146351, 165235, 292702, 330470, 585404, 660940, 731755, 1024457, 1463510, 2048914, 2927020, 4097828, 5122285, 10244570, 20489140]

約数ペア:

[(1, 20489140), (2, 10244570), (4, 5122285), (5, 4097828), (7, 2927020), (10, 2048914), (14, 1463510), (20, 1024457), (28, 731755), (31, 660940), (35, 585404), (62, 330470), (70, 292702), (124, 165235), (140, 146351), (155, 132188), (217, 94420), (310, 66094), (434, 47210), (620, 33047), (868, 23605), (1085, 18884), (2170, 9442), (4340, 4721)]