205415870 has 64 divisors (see below), whose sum is σ = 413683200. Its totient is φ = 72816000.

The previous prime is 205415867. The next prime is 205415891. The reversal of 205415870 is 78514502.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1360295 + ... + 1360445.

It is an arithmetic number, because the mean of its divisors is an integer number (6463800).

Almost surely, 2^205415870 is an apocalyptic number.

205415870 is an abundant number, since it is smaller than the sum of its proper divisors (208267330).

205415870 is a wasteful number, since it uses less digits than its factorization.

205415870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 205415870 is about 14332.3365157256. The cubic root of 205415870 is about 590.0353038340.

The spelling of 205415870 in words is "two hundred five million, four hundred fifteen thousand, eight hundred seventy".