地址20字节，每个字节8位
地址是40个十六进制字符，以0x开头
地址二进制为160位，可以用uint160存储二进制，比如F=15=1111
二进制
pragma solidity ^0.4.6;
contract Test{
address _owner;
uint160 _ownerUnit160;
function Test(){
//_owner = msg.sender;
_owner = 0x692a70d2e424a56d2c6c27aa97d1a86395877b3a;
_ownerUnit160 = 600390490573417107734196837658615486935080598330;
}
function owner() returns(address){
return _owner;
}
function ownerUnit160() returns(uint160){
return uint160(_owner);
}
function ownerAddress() returns(address){
return address(_ownerUnit160);
}
}