205405470 has 96 divisors (see below), whose sum is σ = 558780768. Its totient is φ = 54286848.

The previous prime is 205405427. The next prime is 205405471. The reversal of 205405470 is 74504502.

205405470 is a `hidden beast` number, since 2 + 0 + 540 + 54 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205405471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 332602 + ... + 333218.

It is an arithmetic number, because the mean of its divisors is an integer number (5820633).

Almost surely, 2^205405470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205405470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279390384).

205405470 is an abundant number, since it is smaller than the sum of its proper divisors (353375298).

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

205405470 is a wasteful number, since it uses less digits than its factorization.

205405470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 205405470 is about 14331.9736952033. The cubic root of 205405470 is about 590.0253460336.

Adding to 205405470 its reverse (74504502), we get a palindrome (279909972).

The spelling of 205405470 in words is "two hundred five million, four hundred five thousand, four hundred seventy".