1291216720

素因数分解:

$2^4\times 5^1\times {\mathrm{16140209}}^1$

素因数の和:16140222

約数の個数: 20

約数和(自身を含む): 3002079060

約数和(自身を除く): 1710862340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 16140209, 32280418, 64560836, 80701045, 129121672, 161402090, 258243344, 322804180, 645608360, 1291216720]

約数ペア:

[(1, 1291216720), (2, 645608360), (4, 322804180), (5, 258243344), (8, 161402090), (10, 129121672), (16, 80701045), (20, 64560836), (40, 32280418), (80, 16140209)]