How can I calculate the number of zero divisors in the ring $$\mathbb Z /n\mathbb Z$$ for $n = 1.000.000$?
2026-04-24 11:05:37.1777028737
How many zero divisors does a ring have?
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Hint:
Every nonzero element in a finite ring with unity is either a unit or a zero divisor.
Can you calculate the number of units in the ring $\mathbb Z/1000000\mathbb Z$?