210004020 has 72 divisors (see below), whose sum is σ = 649060776. Its totient is φ = 54941952.

The previous prime is 210004001. The next prime is 210004021. The reversal of 210004020 is 20400012.

210004020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 54552996 + 155451024 = 7386^2 + 12468^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210003993 and 210004011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210004021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1467 + ... + 20546.

It is an arithmetic number, because the mean of its divisors is an integer number (9014733).

Almost surely, 2^210004020 is an apocalyptic number.

210004020 is a gapful number since it is divisible by the number (20) 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 210004020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324530388).

210004020 is an abundant number, since it is smaller than the sum of its proper divisors (439056756).

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

210004020 is a wasteful number, since it uses less digits than its factorization.

210004020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22081 (or 22076 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 210004020 is about 14491.5154487031. The cubic root of 210004020 is about 594.3959880404.

Adding to 210004020 its reverse (20400012), we get a palindrome (230404032).

The spelling of 210004020 in words is "two hundred ten million, four thousand, twenty".