20405920

素因数分解:

$2^5\times 5^1\times {\mathrm{89}}^1\times {\mathrm{1433}}^1$

素因数の和:1537

約数の個数: 48

約数和(自身を含む): 48784680

約数和(自身を除く): 28378760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 89, 160, 178, 356, 445, 712, 890, 1424, 1433, 1780, 2848, 2866, 3560, 5732, 7120, 7165, 11464, 14240, 14330, 22928, 28660, 45856, 57320, 114640, 127537, 229280, 255074, 510148, 637685, 1020296, 1275370, 2040592, 2550740, 4081184, 5101480, 10202960, 20405920]

約数ペア:

[(1, 20405920), (2, 10202960), (4, 5101480), (5, 4081184), (8, 2550740), (10, 2040592), (16, 1275370), (20, 1020296), (32, 637685), (40, 510148), (80, 255074), (89, 229280), (160, 127537), (178, 114640), (356, 57320), (445, 45856), (712, 28660), (890, 22928), (1424, 14330), (1433, 14240), (1780, 11464), (2848, 7165), (2866, 7120), (3560, 5732)]