728728720

素因数分解:

$2^4\times 5^1\times {\mathrm{9109109}}^1$

素因数の和:9109122

約数の個数: 20

約数和(自身を含む): 1694294460

約数和(自身を除く): 965565740

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 9109109, 18218218, 36436436, 45545545, 72872872, 91091090, 145745744, 182182180, 364364360, 728728720]

約数ペア:

[(1, 728728720), (2, 364364360), (4, 182182180), (5, 145745744), (8, 91091090), (10, 72872872), (16, 45545545), (20, 36436436), (40, 18218218), (80, 9109109)]