12880720

素因数分解:

$2^4\times 5^1\times {\mathrm{161009}}^1$

素因数の和:161022

約数の個数: 20

約数和(自身を含む): 29947860

約数和(自身を除く): 17067140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 161009, 322018, 644036, 805045, 1288072, 1610090, 2576144, 3220180, 6440360, 12880720]

約数ペア:

[(1, 12880720), (2, 6440360), (4, 3220180), (5, 2576144), (8, 1610090), (10, 1288072), (16, 805045), (20, 644036), (40, 322018), (80, 161009)]