205131020 has 24 divisors (see below), whose sum is σ = 449505504. Its totient is φ = 78484736.

The previous prime is 205131013. The next prime is 205131037. The reversal of 205131020 is 20131502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 205130986 and 205131004.

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, 222509 + ... + 223428.

It is an arithmetic number, because the mean of its divisors is an integer number (18729396).

Almost surely, 2^205131020 is an apocalyptic number.

205131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205131020 is an abundant number, since it is smaller than the sum of its proper divisors (244374484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205131020 is a wasteful number, since it uses less digits than its factorization.

205131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445969 (or 445967 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 205131020 is about 14322.3957493151. The cubic root of 205131020 is about 589.7624438640.

Adding to 205131020 its reverse (20131502), we get a palindrome (225262522).

The spelling of 205131020 in words is "two hundred five million, one hundred thirty-one thousand, twenty".