Is There A Pattern To It?

Number Theory Level pending

1 odd , 2 even , 3 odd , 4 even , 5 odd , 6 even , 8 even , 9 odd , 10 even , 12 even , 15 odd , \large \underbrace1_{\text{odd}}, \underbrace2_{\text{even}}, \underbrace3_{\text{odd}}, \underbrace4_{\text{even}}, \underbrace5_{\text{odd}}, \underbrace{6}_{\text{even}}, \underbrace{8}_{\text{even}}, \underbrace9_{\text{odd}}, \underbrace{10}_{\text{even}},\underbrace{12}_{\text{even}},\underbrace{15}_{\text{odd}} , \ldots

Above shows an incomplete list of factors of the number 1440, some of these factors are odd and some are even. How many of these factors are even?

20 25 30 32 50

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