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They refer to the sum of a number's proper divisors, defined here as all of the factors except the number itself.
- a perfect number equals the sum of its proper divisors
- a deficient number is greater than the sum of its proper divisors
- an abundant number is less than the sum of its proper divisors
Wiki User
∙ 11y ago
Wiki User
∙ 8y ago2: 1, 2 (3) deficient
3: 1, 3 (4) deficient
4: 1, 2, 4 (7) deficient
5: 1, 5 (6) deficient
6: 1, 2, 3, 6 (12) perfect
7: 1, 7 (8) deficient
8: 1, 2, 4, 8 (15) deficient
9: 1, 3, 9 (13) deficient
10: 1, 2, 5, 10 (18) deficient
11: 1, 11 (12) deficient
12: 1, 2, 3, 4, 6, 12 (28) abundant
13: 1, 13 (14) deficient
14: 1, 2, 7, 14 (24) deficient
15: 1, 3, 5, 15 (24) deficient
16: 1, 2, 4, 8, 16 (31) deficient
17: 1, 17 (18) deficient
18: 1, 2, 3, 6, 9, 18 (39) abundant
19: 1, 19 (20) deficient
20: 1, 2, 4, 5, 10, 20 (42) abundant
21: 1, 3, 7, 21 (32) deficient
22: 1, 2, 11, 22 (26) deficient
23: 1, 23 (24) deficient
24: 1, 2, 3, 4, 6, 8, 12, 24 (60) abundant
25: 1, 5, 25 (31) deficient
26: 1, 2, 13, 26 (42) deficient
27: 1, 3, 9, 27 (40) deficient
28: 1, 2, 4, 7, 14, 28 (56) perfect
29: 1, 29 (30) deficient
30: 1, 2, 3, 5, 6, 10, 15, 30 (72) abundant
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