890990020

素因数分解:

$2^2\times 5^1\times {\mathrm{349}}^1\times {\mathrm{127649}}^1$

素因数の和:128007

約数の個数: 24

約数和(自身を含む): 1876455000

約数和(自身を除く): 985464980

約数列:

[1, 2, 4, 5, 10, 20, 349, 698, 1396, 1745, 3490, 6980, 127649, 255298, 510596, 638245, 1276490, 2552980, 44549501, 89099002, 178198004, 222747505, 445495010, 890990020]

約数ペア:

[(1, 890990020), (2, 445495010), (4, 222747505), (5, 178198004), (10, 89099002), (20, 44549501), (349, 2552980), (698, 1276490), (1396, 638245), (1745, 510596), (3490, 255298), (6980, 127649)]