20205425 has 6 divisors (see below), whose sum is σ = 25054758. Its totient is φ = 16164320.

The previous prime is 20205389. The next prime is 20205467. The reversal of 20205425 is 52450202.

It can be written as a sum of positive squares in 3 ways, for example, as 7187761 + 13017664 = 2681^2 + 3608^2 .

It is not a de Polignac number, because 20205425 - 2¹² = 20201329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20205397 and 20205406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404084 + ... + 404133.

It is an arithmetic number, because the mean of its divisors is an integer number (4175793).

Almost surely, 2^20205425 is an apocalyptic number.

20205425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20205425 is a deficient number, since it is larger than the sum of its proper divisors (4849333).

20205425 is an equidigital number, since it uses as much as digits as its factorization.

20205425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808227 (or 808222 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20205425 is about 4495.0444936619. The cubic root of 20205425 is about 272.3679465663.

Adding to 20205425 its reverse (52450202), we get a palindrome (72655627).

The spelling of 20205425 in words is "twenty million, two hundred five thousand, four hundred twenty-five".