20005425 has 72 divisors (see below), whose sum is σ = 40042080. Its totient is φ = 9465600.

The previous prime is 20005397. The next prime is 20005429. The reversal of 20005425 is 52450002.

It is not a de Polignac number, because 20005425 - 2⁵ = 20005393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20005398 and 20005407.

It is not an unprimeable number, because it can be changed into a prime (20005429) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 145957 + ... + 146093.

It is an arithmetic number, because the mean of its divisors is an integer number (556140).

Almost surely, 2^20005425 is an apocalyptic number.

20005425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20005425 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20005425 is a wasteful number, since it uses less digits than its factorization.

20005425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20005425 is about 4472.7424473135. The cubic root of 20005425 is about 271.4663023000.

Adding to 20005425 its reverse (52450002), we get a palindrome (72455427).

The spelling of 20005425 in words is "twenty million, five thousand, four hundred twenty-five".