205215500 has 96 divisors (see below), whose sum is σ = 542505600. Its totient is φ = 66201600.

The previous prime is 205215497. The next prime is 205215539. The reversal of 205215500 is 5512502.

205215500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×205215500² = 84226802880500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57776 + ... + 61224.

It is an arithmetic number, because the mean of its divisors is an integer number (5651100).

Almost surely, 2^205215500 is an apocalyptic number.

205215500 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 205215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271252800).

205215500 is an abundant number, since it is smaller than the sum of its proper divisors (337290100).

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

205215500 is a wasteful number, since it uses less digits than its factorization.

205215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492 (or 3480 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 205215500 is about 14325.3446729913. The cubic root of 205215500 is about 589.8433942296.

The spelling of 205215500 in words is "two hundred five million, two hundred fifteen thousand, five hundred".