20427445 has 4 divisors (see below), whose sum is σ = 24512940. Its totient is φ = 16341952.

The previous prime is 20427439. The next prime is 20427457. The reversal of 20427445 is 54472402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7017201 + 13410244 = 2649^2 + 3662^2 .

It is a cyclic number.

It is not a de Polignac number, because 20427445 - 2³ = 20427437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2042740 + ... + 2042749.

It is an arithmetic number, because the mean of its divisors is an integer number (6128235).

Almost surely, 2^20427445 is an apocalyptic number.

It is an amenable number.

20427445 is a deficient number, since it is larger than the sum of its proper divisors (4085495).

20427445 is an equidigital number, since it uses as much as digits as its factorization.

20427445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085494.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 20427445 is about 4519.6731076484. The cubic root of 20427445 is about 273.3619203031.

Adding to 20427445 its reverse (54472402), we get a palindrome (74899847).

The spelling of 20427445 in words is "twenty million, four hundred twenty-seven thousand, four hundred forty-five".