20145175 has 6 divisors (see below), whose sum is σ = 24980048. Its totient is φ = 16116120.

The previous prime is 20145173. The next prime is 20145193. The reversal of 20145175 is 57154102.

It is not a de Polignac number, because 20145175 - 2¹ = 20145173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 805807 = 20145175 / (2 + 0 + 1 + 4 + 5 + 1 + 7 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402879 + ... + 402928.

Almost surely, 2^20145175 is an apocalyptic number.

20145175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20145175 is a deficient number, since it is larger than the sum of its proper divisors (4834873).

20145175 is an equidigital number, since it uses as much as digits as its factorization.

20145175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805817 (or 805812 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 20145175 is about 4488.3376655506. The cubic root of 20145175 is about 272.0969548753.

Adding to 20145175 its reverse (57154102), we get a palindrome (77299277).

The spelling of 20145175 in words is "twenty million, one hundred forty-five thousand, one hundred seventy-five".