Armstrong Number

#!/bin/bash
# SCRIPT: armstrongnumber.sh
# PURPOSE: Check if the given number is Armstrong number ?
#
# Armstrong numbers are the sum of their own digits to the power of the number of digits.
# As that is a slightly brief wording, let me give an example:
# 153 = 1³ + 5³ + 3³
# Each digit is raised to the power three because 153 has three digits.
# They are totalled and we get the original number again!
# Notice that Armstrong numbers are base dependent,but we'll mainly be
# dealing with base 10 examples.The Armstrong numbers up to 5 digits
# are 1 to 9,153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727,93084
#
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# Script Starts Here #

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echo -n "Enter the number: "
read Number
Length=${#Number}
Sum=0
OldNumber=$Number

while [ $Number -ne 0 ]
do
Rem=$((Number%10))
Number=$((Number/10))
Power=$(echo "$Rem ^ $Length" | bc )
Sum=$((Sum+$Power))
done