78880280

素因数分解:

$2^3\times 5^1\times {\mathrm{1972007}}^1$

素因数の和:1972018

約数の個数: 16

約数和(自身を含む): 177480720

約数和(自身を除く): 98600440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1972007, 3944014, 7888028, 9860035, 15776056, 19720070, 39440140, 78880280]

約数ペア:

[(1, 78880280), (2, 39440140), (4, 19720070), (5, 15776056), (8, 9860035), (10, 7888028), (20, 3944014), (40, 1972007)]