1440020

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{809}}^1$

素因数の和:907

約数の個数: 24

約数和(自身を含む): 3061800

約数和(自身を除く): 1621780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 809, 890, 1618, 1780, 3236, 4045, 8090, 16180, 72001, 144002, 288004, 360005, 720010, 1440020]

約数ペア:

[(1, 1440020), (2, 720010), (4, 360005), (5, 288004), (10, 144002), (20, 72001), (89, 16180), (178, 8090), (356, 4045), (445, 3236), (809, 1780), (890, 1618)]