42020245205 has 4 divisors (see below), whose sum is σ = 50424294252. Its totient is φ = 33616196160.

The previous prime is 42020245187. The next prime is 42020245229. The reversal of 42020245205 is 50254202024.

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 8407789636 + 33612455569 = 91694^2 + 183337^2 .

It is not a de Polignac number, because 42020245205 - 2⁸ = 42020244949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4202024516 + ... + 4202024525.

It is an arithmetic number, because the mean of its divisors is an integer number (12606073563).

Almost surely, 2^42020245205 is an apocalyptic number.

It is an amenable number.

42020245205 is a deficient number, since it is larger than the sum of its proper divisors (8404049047).

42020245205 is an equidigital number, since it uses as much as digits as its factorization.

42020245205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8404049046.

The product of its (nonzero) digits is 6400, while the sum is 26.

Adding to 42020245205 its reverse (50254202024), we get a palindrome (92274447229).

The spelling of 42020245205 in words is "forty-two billion, twenty million, two hundred forty-five thousand, two hundred five".