How to get the rid of power 10 when plotting a log scale in Python

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Python2.7

I have a log plot and my variables are large numbers in power 10 (10^13..10^17), when plotting I want my axis to be written not in the power 10^x, but instead just the power x..

What I have tried:

nuj= np.logspace(np.log10(1e12), np.log10(1e17), 100)

z,o= np.loadtxt('PKS 1329049 .txt', usecols=[0,2], unpack= True)

plt.xscale('log')
plt.yscale('log')
plt.xlim(1e12, 1e24)
plt.ylim(1e43, 1e48)

plt.show()