205478620 has 12 divisors (see below), whose sum is σ = 431505144. Its totient is φ = 82191440.

The previous prime is 205478587. The next prime is 205478629. The reversal of 205478620 is 26874502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205478629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5136946 + ... + 5136985.

It is an arithmetic number, because the mean of its divisors is an integer number (35958762).

Almost surely, 2^205478620 is an apocalyptic number.

205478620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205478620 is an abundant number, since it is smaller than the sum of its proper divisors (226026524).

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

205478620 is a wasteful number, since it uses less digits than its factorization.

205478620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10273940 (or 10273938 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 205478620 is about 14334.5254543009. The cubic root of 205478620 is about 590.0953786242.

The spelling of 205478620 in words is "two hundred five million, four hundred seventy-eight thousand, six hundred twenty".