19784720

素因数分解:

$2^4\times 5^1\times {\mathrm{247309}}^1$

素因数の和:247322

約数の個数: 20

約数和(自身を含む): 45999660

約数和(自身を除く): 26214940

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247309, 494618, 989236, 1236545, 1978472, 2473090, 3956944, 4946180, 9892360, 19784720]

約数ペア:

[(1, 19784720), (2, 9892360), (4, 4946180), (5, 3956944), (8, 2473090), (10, 1978472), (16, 1236545), (20, 989236), (40, 494618), (80, 247309)]