205421874 has 32 divisors (see below), whose sum is σ = 470745216. Its totient is φ = 58540800.

The previous prime is 205421869. The next prime is 205421963. The reversal of 205421874 is 478124502.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10744 + ... + 22940.

It is an arithmetic number, because the mean of its divisors is an integer number (14710788).

Almost surely, 2^205421874 is an apocalyptic number.

205421874 is an abundant number, since it is smaller than the sum of its proper divisors (265323342).

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

205421874 is a wasteful number, since it uses less digits than its factorization.

205421874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12610.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 205421874 is about 14332.5459706222. The cubic root of 205421874 is about 590.0410523958.

The spelling of 205421874 in words is "two hundred five million, four hundred twenty-one thousand, eight hundred seventy-four".