205428920 has 16 divisors (see below), whose sum is σ = 462215160. Its totient is φ = 82171552.

The previous prime is 205428887. The next prime is 205428929. The reversal of 205428920 is 29824502.

205428920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205428929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2567822 + ... + 2567901.

Almost surely, 2^205428920 is an apocalyptic number.

205428920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205428920 is an abundant number, since it is smaller than the sum of its proper divisors (256786240).

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

205428920 is a wasteful number, since it uses less digits than its factorization.

205428920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135734 (or 5135730 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 205428920 is about 14332.7917727148. The cubic root of 205428920 is about 590.0477984832.

The spelling of 205428920 in words is "two hundred five million, four hundred twenty-eight thousand, nine hundred twenty".