210020985 has 16 divisors (see below), whose sum is σ = 373370880. Its totient is φ = 112011120.

The previous prime is 210020963. The next prime is 210020989. The reversal of 210020985 is 589020012.

It is not a de Polignac number, because 210020985 - 2⁵ = 210020953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (210020989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777721 + ... + 777990.

It is an arithmetic number, because the mean of its divisors is an integer number (23335680).

Almost surely, 2^210020985 is an apocalyptic number.

It is an amenable number.

210020985 is a deficient number, since it is larger than the sum of its proper divisors (163349895).

210020985 is a wasteful number, since it uses less digits than its factorization.

210020985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555725 (or 1555719 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 210020985 is about 14492.1007793901. The cubic root of 210020985 is about 594.4119935378.

Adding to 210020985 its reverse (589020012), we get a palindrome (799040997).

The spelling of 210020985 in words is "two hundred ten million, twenty thousand, nine hundred eighty-five".