Need Help | SHA256

[CrushBF]

Hello !

I need to "crack" a SHA256 hash with 32 characters (yes , it's a long number) but I know the order of the first 20 characters rest of them are randomly generated. 

This is the code I try to run :

hashcat64.exe -m 1400 -a 3 -i --increment-min 32 --increment-max 32 x.hash ?d-?d-?d-?d-?d-?d-?d-?d-?d-?d-?a?a?a?a?a?a?a?a?a?a?a?a

This is what I get  :

Code:

[i][size=x-small]Watchdog: Temperature abort trigger set to 90c[/size][/i]
[i][size=x-small]Watchdog: Temperature retain trigger set to 75c[/size][/i]

[i][size=x-small]Integer overflow detected in keyspace of mask: ?d-?d-?d-?d-?d-?d-?d-?d-?d-?d-?a?a?a?a?a?a?a?a?a?a?a?a[/size][/i]

[i][size=x-small]The wordlist or mask that you are using is too small.[/size][/i]
[i][size=x-small]This means that hashcat cannot use the full parallel power of your device(s).[/size][/i]
[i][size=x-small]Unless you supply more work, your cracking speed will drop.[/size][/i]
[i][size=x-small]For tips on supplying more work, see: https://hashcat.net/faq/morework[/size][/i]

[i][size=x-small]Approaching final keyspace - workload adjusted.[/size][/i]

[i][size=x-small]Session..........: hashcat[/size][/i]
[i][size=x-small]Status...........: Exhausted[/size][/i]
[i][size=x-small]Hash.Type........: SHA-256[/size][/i]
[i][size=x-small]Hash.Target......: 0ab5fadcc12d457294fb2a38f07a665d2e63c2f7088cbaa23cf...bef80a[/size][/i]
[i][size=x-small]Time.Started.....: Mon Aug 14 03:28:13 2017 (0 secs)[/size][/i]
[i][size=x-small]Time.Estimated...: Mon Aug 14 03:28:13 2017 (0 secs)[/size][/i]
[i][size=x-small]Guess.Mask.......: ?d-?d-?d-?d-?d-?d-?d-?d-?d-?d-?a?a?a?a?a?a?a?a?a?a?a?a [32][/size][/i]
[i][size=x-small]Guess.Queue......: 1/1 (100.00%)[/size][/i]
[i][size=x-small]Speed.Dev.#3.....:        0 H/s (0.00ms)[/size][/i]
[i][size=x-small]Recovered........: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts[/size][/i]
[i][size=x-small]Progress.........: 0[/size][/i]
[i][size=x-small]Rejected.........: 0[/size][/i]
[i][size=x-small]Restore.Point....: 0[/size][/i]
[i][size=x-small]Candidates.#3....: [Generating][/size][/i]
[i][size=x-small]HWMon.Dev.#3.....: Temp: 49c Fan: 25% Util: 37% Core: 950MHz Mem:1000MHz Bus:4[/size][/i]

[i][size=x-small]Started: Mon Aug 14 03:28:12 2017[/size][/i]
[i][size=x-small]Stopped: Mon Aug 14 03:28:14 2017[/size][/i]

Any advice will be high apreciated