1279280

素因数分解:

$2^4\times 5^1\times {\mathrm{15991}}^1$

素因数の和:16004

約数の個数: 20

約数和(自身を含む): 2974512

約数和(自身を除く): 1695232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 15991, 31982, 63964, 79955, 127928, 159910, 255856, 319820, 639640, 1279280]

約数ペア:

[(1, 1279280), (2, 639640), (4, 319820), (5, 255856), (8, 159910), (10, 127928), (16, 79955), (20, 63964), (40, 31982), (80, 15991)]