205011020 has 24 divisors (see below), whose sum is σ = 433918464. Its totient is φ = 81357696.

The previous prime is 205011019. The next prime is 205011031. The reversal of 205011020 is 20110502.

It is a junction number, because it is equal to n+sod(n) for n = 205010992 and 205011010.

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, 37817 + ... + 42896.

It is an arithmetic number, because the mean of its divisors is an integer number (18079936).

Almost surely, 2^205011020 is an apocalyptic number.

205011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205011020 is an abundant number, since it is smaller than the sum of its proper divisors (228907444).

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

205011020 is a wasteful number, since it uses less digits than its factorization.

205011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80849 (or 80847 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 205011020 is about 14318.2058931977. The cubic root of 205011020 is about 589.6474193331.

Adding to 205011020 its reverse (20110502), we get a palindrome (225121522).

The spelling of 205011020 in words is "two hundred five million, eleven thousand, twenty".