In number theory, an  **[abundant](https://en.wikipedia.org/wiki/Abundant_number)** number or an **[excessive](https://en.wikipedia.org/wiki/Abundant_number)** number is one for which the sum of it's **[proper divisors](http://mathworld.wolfram.com/ProperDivisor.html)** is greater than the number itself.  The integer **12** is the first abundant number. Its proper divisors are 1, 2, 3, 4 and 6 for a total of **16**. The amount by which the sum exceeds the number is the **abundance**. The number **12** has an abundance of **4**, for example. Other initial abundant numbers are : 12, 18, 20, 24, 30, 36, 40, 42, 48, 54 etc . **Infinitely** many **odd** and **even** abundant numbers exist.    
As you should have guessed by now, in this kata your function will take a positive integer **h** as range input and return a nested array/list that will contain the following informations-    

* Highest available **odd** or **even** abundant number in that range
* It's **abundance**    

Examples
--------
A few examples never hurt nobody, right???    

```rust   
abundant(15)  = [[12], [4]]
abundant(19)  = [[18], [3]]
abundant(100) = [[100], [17]]
abundant(999) = [[996], [360]]
```

Tips
----
The problem involves some pretty big random numbers. So try to optimize your code for performance as far as you can. And yes, the input argument will always be positive integers. So no need to check there.

Good luck!

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def abundant(limit):\n    for n in range(limit, 0, -1):\n        div_sum = sum(x for x in range(1, n//2 + 1) if n%x == 0)\n        if div_sum > n:\n            return [ [n], [div_sum - n] ]'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'abundant'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 5682