20171075 has 12 divisors (see below), whose sum is σ = 25316088. Its totient is φ = 15940800.

The previous prime is 20171071. The next prime is 20171083. The reversal of 20171075 is 57017102.

It is a happy number.

It is not a de Polignac number, because 20171075 - 2² = 20171071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20171075.

It is not an unprimeable number, because it can be changed into a prime (20171071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2786 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (2109674).

Almost surely, 2^20171075 is an apocalyptic number.

20171075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20171075 is a deficient number, since it is larger than the sum of its proper divisors (5145013).

20171075 is an equidigital number, since it uses as much as digits as its factorization.

20171075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9814 (or 9809 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 20171075 is about 4491.2219940680. The cubic root of 20171075 is about 272.2135136894.

Adding to 20171075 its reverse (57017102), we get a palindrome (77188177).

The spelling of 20171075 in words is "twenty million, one hundred seventy-one thousand, seventy-five".