640240840

素因数分解:

$2^3\times 5^1\times {\mathrm{16006021}}^1$

素因数の和:16006032

約数の個数: 16

約数和(自身を含む): 1440541980

約数和(自身を除く): 800301140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 16006021, 32012042, 64024084, 80030105, 128048168, 160060210, 320120420, 640240840]

約数ペア:

[(1, 640240840), (2, 320120420), (4, 160060210), (5, 128048168), (8, 80030105), (10, 64024084), (20, 32012042), (40, 16006021)]