16640720

素因数分解:

$2^4\times 5^1\times {\mathrm{208009}}^1$

素因数の和:208022

約数の個数: 20

約数和(自身を含む): 38689860

約数和(自身を除く): 22049140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 208009, 416018, 832036, 1040045, 1664072, 2080090, 3328144, 4160180, 8320360, 16640720]

約数ペア:

[(1, 16640720), (2, 8320360), (4, 4160180), (5, 3328144), (8, 2080090), (10, 1664072), (16, 1040045), (20, 832036), (40, 416018), (80, 208009)]