Answer
2680 is not perfect because:
1 + 2 + 4 + 5 + 8 + 10 + 20 + 40 + 67 + 134 + 268 + 335 + 536 + 670 + 1340 ≠ 2680
Related links:
- All calculations
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- What is the prime factorization of 2680?