205506156 has 12 divisors (see below), whose sum is σ = 479514392. Its totient is φ = 68502048.

The previous prime is 205506139. The next prime is 205506167. The reversal of 205506156 is 651605502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8562745 + ... + 8562768.

Almost surely, 2^205506156 is an apocalyptic number.

It is an amenable number.

205506156 is an abundant number, since it is smaller than the sum of its proper divisors (274008236).

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

205506156 is a wasteful number, since it uses less digits than its factorization.

205506156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17125520 (or 17125518 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 205506156 is about 14335.4859003802. The cubic root of 205506156 is about 590.1217368257.

The spelling of 205506156 in words is "two hundred five million, five hundred six thousand, one hundred fifty-six".