400720

素因数分解:

$2^4\times 5^1\times {\mathrm{5009}}^1$

素因数の和:5022

約数の個数: 20

約数和(自身を含む): 931860

約数和(自身を除く): 531140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 5009, 10018, 20036, 25045, 40072, 50090, 80144, 100180, 200360, 400720]

約数ペア:

[(1, 400720), (2, 200360), (4, 100180), (5, 80144), (8, 50090), (10, 40072), (16, 25045), (20, 20036), (40, 10018), (80, 5009)]