20042005 has 8 divisors (see below), whose sum is σ = 24458400. Its totient is φ = 15761616.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20042005 is 50024002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20042005 - 2¹³ = 20033813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33675 + ... + 34264.

It is an arithmetic number, because the mean of its divisors is an integer number (3057300).

Almost surely, 2^20042005 is an apocalyptic number.

It is an amenable number.

20042005 is a deficient number, since it is larger than the sum of its proper divisors (4416395).

20042005 is an equidigital number, since it uses as much as digits as its factorization.

20042005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68003.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20042005 is about 4476.8297935034. The cubic root of 20042005 is about 271.6316606297.

Adding to 20042005 its reverse (50024002), we get a palindrome (70066007).

The spelling of 20042005 in words is "twenty million, forty-two thousand, five".