205102 has 4 divisors (see below), whose sum is σ = 307656. Its totient is φ = 102550.
The previous prime is 205097. The next prime is 205103. The reversal of 205102 is 201502.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (205103) by changing a digit.
205102 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51274 + ... + 51277.
It is an arithmetic number, because the mean of its divisors is an integer number (76914).
2205102 is an apocalyptic number.
205102 is a deficient number, since it is larger than the sum of its proper divisors (102554).
205102 is a wasteful number, since it uses less digits than its factorization.
205102 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 102553.
The product of its (nonzero) digits is 20, while the sum is 10.
The square root of 205102 is about 452.8818830556. The cubic root of 205102 is about 58.9734631212.
Adding to 205102 its reverse (201502), we get a palindrome (406604).
Subtracting from 205102 its reverse (201502), we obtain a square (3600 = 602).
It can be divided in two parts, 205 and 102, that multiplied together give a triangular number (20910 = T204).
The spelling of 205102 in words is "two hundred five thousand, one hundred two".
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