205500000 has 168 divisors, whose sum is σ = 679210056. Its totient is φ = 54400000.

The previous prime is 205499971. The next prime is 205500007. The reversal of 205500000 is 5502.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205500007) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1499932 + ... + 1500068.

It is an arithmetic number, because the mean of its divisors is an integer number (4042917).

Almost surely, 2^205500000 is an apocalyptic number.

205500000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339605028).

205500000 is an abundant number, since it is smaller than the sum of its proper divisors (473710056).

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

205500000 is an frugal number, since it uses more digits than its factorization.

205500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 12.

The square root of 205500000 is about 14335.2711868315. The cubic root of 205500000 is about 590.1158443409.

Adding to 205500000 its reverse (5502), we get a palindrome (205505502).

The spelling of 205500000 in words is "two hundred five million, five hundred thousand".