205020427 has 4 divisors (see below), whose sum is σ = 207829000. Its totient is φ = 202211856.

The previous prime is 205020421. The next prime is 205020449. The reversal of 205020427 is 724020502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205020427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205020398 and 205020407.

It is not an unprimeable number, because it can be changed into a prime (205020421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1404177 + ... + 1404322.

It is an arithmetic number, because the mean of its divisors is an integer number (51957250).

Almost surely, 2^205020427 is an apocalyptic number.

205020427 is a deficient number, since it is larger than the sum of its proper divisors (2808573).

205020427 is an equidigital number, since it uses as much as digits as its factorization.

205020427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808572.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 205020427 is about 14318.5343872898. The cubic root of 205020427 is about 589.6564379190.

Adding to 205020427 its reverse (724020502), we get a palindrome (929040929).

The spelling of 205020427 in words is "two hundred five million, twenty thousand, four hundred twenty-seven".