205820153 has 12 divisors (see below), whose sum is σ = 258552000. Its totient is φ = 160378680.

The previous prime is 205820099. The next prime is 205820177. The reversal of 205820153 is 351028502.

It is not a de Polignac number, because 205820153 - 2⁶ = 205820089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205822153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120653 + ... + 122346.

It is an arithmetic number, because the mean of its divisors is an integer number (21546000).

Almost surely, 2^205820153 is an apocalyptic number.

It is an amenable number.

205820153 is a deficient number, since it is larger than the sum of its proper divisors (52731847).

205820153 is a wasteful number, since it uses less digits than its factorization.

205820153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243028 (or 243017 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205820153 is about 14346.4334592260. The cubic root of 205820153 is about 590.4221368492.

Adding to 205820153 its reverse (351028502), we get a palindrome (556848655).

The spelling of 205820153 in words is "two hundred five million, eight hundred twenty thousand, one hundred fifty-three".