204871836 has 48 divisors (see below), whose sum is σ = 523555200. Its totient is φ = 61966272.

The previous prime is 204871819. The next prime is 204871837. The reversal of 204871836 is 638178402.

It is a super-3 number, since 3×204871836³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 204871794 and 204871803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204871837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (10907400).

Almost surely, 2^204871836 is an apocalyptic number.

204871836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204871836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261777600).

204871836 is an abundant number, since it is smaller than the sum of its proper divisors (318683364).

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

204871836 is a wasteful number, since it uses less digits than its factorization.

204871836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22338 (or 22336 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 204871836 is about 14313.3446824982. The cubic root of 204871836 is about 589.5139499778.

The spelling of 204871836 in words is "two hundred four million, eight hundred seventy-one thousand, eight hundred thirty-six".