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204890 = 2572927
BaseRepresentation
bin110010000001011010
3101102001112
4302001122
523024030
64220322
71512230
oct620132
9342045
10204890
1112aa34
129a6a2
137234a
1454950
1540a95
hex3205a

204890 has 16 divisors (see below), whose sum is σ = 421632. Its totient is φ = 70224.

The previous prime is 204887. The next prime is 204913. The reversal of 204890 is 98402.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 204890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1394 + ... + 1533.

It is an arithmetic number, because the mean of its divisors is an integer number (26352).

2204890 is an apocalyptic number.

204890 is an abundant number, since it is smaller than the sum of its proper divisors (216742).

It is a weird number, because it is abundant, but not a pseudoperfect number.

204890 is a wasteful number, since it uses less digits than its factorization.

204890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 204890 is about 452.6477659284. The cubic root of 204890 is about 58.9531371626.

The spelling of 204890 in words is "two hundred four thousand, eight hundred ninety".

Divisors: 1 2 5 7 10 14 35 70 2927 5854 14635 20489 29270 40978 102445 204890