20171425 has 6 divisors (see below), whose sum is σ = 25012598. Its totient is φ = 16137120.

The previous prime is 20171423. The next prime is 20171449. The reversal of 20171425 is 52417102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2430481 + 17740944 = 1559^2 + 4212^2 .

It is not a de Polignac number, because 20171425 - 2¹ = 20171423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20171396 and 20171405.

It is not an unprimeable number, because it can be changed into a prime (20171423) 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, 403404 + ... + 403453.

Almost surely, 2^20171425 is an apocalyptic number.

20171425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20171425 is a deficient number, since it is larger than the sum of its proper divisors (4841173).

20171425 is an equidigital number, since it uses as much as digits as its factorization.

20171425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806867 (or 806862 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20171425 is about 4491.2609587954. The cubic root of 20171425 is about 272.2150881250.

Adding to 20171425 its reverse (52417102), we get a palindrome (72588527).

The spelling of 20171425 in words is "twenty million, one hundred seventy-one thousand, four hundred twenty-five".