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The distinct prime factors of 550 are 2, 5 and 11. They add up to 18.
12 distinct factors: 1 2 3 4 6 8 9 12 18 24 36 72.
81=9^29+9=1877=7*117+11=18
Six factors.
The distinct factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100.