205145427 has 16 divisors (see below), whose sum is σ = 287777952. Its totient is φ = 129818880.

The previous prime is 205145417. The next prime is 205145431. The reversal of 205145427 is 724541502.

It is a de Polignac number, because none of the positive numbers 2^k-205145427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205145394 and 205145403.

It is not an unprimeable number, because it can be changed into a prime (205145407) 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 15 ways as a sum of consecutive naturals, for example, 17988 + ... + 27089.

It is an arithmetic number, because the mean of its divisors is an integer number (17986122).

Almost surely, 2^205145427 is an apocalyptic number.

205145427 is a deficient number, since it is larger than the sum of its proper divisors (82632525).

205145427 is a wasteful number, since it uses less digits than its factorization.

205145427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45158.

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 205145427 is about 14322.8986940493. The cubic root of 205145427 is about 589.7762505010.

Adding to 205145427 its reverse (724541502), we get a palindrome (929686929).

The spelling of 205145427 in words is "two hundred five million, one hundred forty-five thousand, four hundred twenty-seven".