201685820 has 48 divisors (see below), whose sum is σ = 485184000. Its totient is φ = 68986944.

The previous prime is 201685753. The next prime is 201685843. The reversal of 201685820 is 28586102.

201685820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68417 + ... + 71303.

It is an arithmetic number, because the mean of its divisors is an integer number (10108000).

Almost surely, 2^201685820 is an apocalyptic number.

201685820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201685820 is an abundant number, since it is smaller than the sum of its proper divisors (283498180).

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

201685820 is a wasteful number, since it uses less digits than its factorization.

201685820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 201685820 is about 14201.6132886373. The cubic root of 201685820 is about 586.4420749874.

The spelling of 201685820 in words is "two hundred one million, six hundred eighty-five thousand, eight hundred twenty".