There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.
Because it is divisible by the prime number 2, which is less than 10.
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
They are: 6, 8, 10 and 15 all of which have 4 factors
Ten is not abundant because the sum of its proper factors is less than itself.
48 has 10 factors, the most factors of any number under 50.
64
Subtraction of 10 from 2000 gives the required number. 2000 - 10 = 1990 is 10 less than 2000.
Any number is a factor and a multiple of itself. Other factors are less than the number, other multiples are more. 5 is a factor of 10. 10 is a multiple of 5.
3x-10
2, 3 and 7
655 - 10 = 645
Try 60. It has factors of 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.
2
665
10
19 is a prime number and has no factors other than itself and 1. The factors of 10 are 2 and 5.