20420720

素因数分解:

$2^4\times 5^1\times {\mathrm{255259}}^1$

素因数の和:255272

約数の個数: 20

約数和(自身を含む): 47478360

約数和(自身を除く): 27057640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 255259, 510518, 1021036, 1276295, 2042072, 2552590, 4084144, 5105180, 10210360, 20420720]

約数ペア:

[(1, 20420720), (2, 10210360), (4, 5105180), (5, 4084144), (8, 2552590), (10, 2042072), (16, 1276295), (20, 1021036), (40, 510518), (80, 255259)]