205185020 has 12 divisors (see below), whose sum is σ = 430888584. Its totient is φ = 82074000.

The previous prime is 205184999. The next prime is 205185023. The reversal of 205185020 is 20581502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205185023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5129606 + ... + 5129645.

It is an arithmetic number, because the mean of its divisors is an integer number (35907382).

Almost surely, 2^205185020 is an apocalyptic number.

205185020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205185020 is an abundant number, since it is smaller than the sum of its proper divisors (225703564).

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

205185020 is a wasteful number, since it uses less digits than its factorization.

205185020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10259260 (or 10259258 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 205185020 is about 14324.2807847375. The cubic root of 205185020 is about 589.8141902678.

The spelling of 205185020 in words is "two hundred five million, one hundred eighty-five thousand, twenty".