20427005 has 4 divisors (see below), whose sum is σ = 24512412. Its totient is φ = 16341600.

The previous prime is 20426993. The next prime is 20427007. The reversal of 20427005 is 50072402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50072402 = 2 ⋅25036201.

It can be written as a sum of positive squares in 2 ways, for example, as 6692569 + 13734436 = 2587^2 + 3706^2 .

It is not a de Polignac number, because 20427005 - 2⁶ = 20426941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2042696 + ... + 2042705.

It is an arithmetic number, because the mean of its divisors is an integer number (6128103).

Almost surely, 2^20427005 is an apocalyptic number.

It is an amenable number.

20427005 is a deficient number, since it is larger than the sum of its proper divisors (4085407).

20427005 is an equidigital number, since it uses as much as digits as its factorization.

20427005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085406.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20427005 is about 4519.6244312996. The cubic root of 20427005 is about 273.3599575824.

Adding to 20427005 its reverse (50072402), we get a palindrome (70499407).

The spelling of 20427005 in words is "twenty million, four hundred twenty-seven thousand, five".