205716420 has 288 divisors, whose sum is σ = 809652480. Its totient is φ = 41057280.

The previous prime is 205716397. The next prime is 205716431. The reversal of 205716420 is 24617502.

205716420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 310890 + ... + 311550.

Almost surely, 2^205716420 is an apocalyptic number.

205716420 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 205716420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404826240).

205716420 is an abundant number, since it is smaller than the sum of its proper divisors (603936060).

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

205716420 is a wasteful number, since it uses less digits than its factorization.

205716420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 205716420 is about 14342.8177148007. The cubic root of 205716420 is about 590.3229296031.

The spelling of 205716420 in words is "two hundred five million, seven hundred sixteen thousand, four hundred twenty".