There are 32: 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 56 60 70 84 105 120 140 168 210 280 420 840.
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Seven distinct factors.
The prime factors of 840 are: 2, 3, 5, 7.
Nine distinct factors: 1 2 3 4 6 9 12 18 36.
840
Two distinct prime factors, six total prime factors.