210020 has 12 divisors (see below), whose sum is σ = 441084. Its totient is φ = 84000.

The previous prime is 210019. The next prime is 210031. The reversal of 210020 is 20012.

It can be written as a sum of positive squares in 2 ways, for example, as 68644 + 141376 = 262^2 + 376^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 209986 and 210013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5231 + ... + 5270.

It is an arithmetic number, because the mean of its divisors is an integer number (36757).

2²¹⁰⁰²⁰ is an apocalyptic number.

210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020 is an abundant number, since it is smaller than the sum of its proper divisors (231064).

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

210020 is a wasteful number, since it uses less digits than its factorization.

210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510 (or 10508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 210020 is about 458.2793907651. The cubic root of 210020 is about 59.4411064271.

Adding to 210020 its reverse (20012), we get a palindrome (230032).

The spelling of 210020 in words is "two hundred ten thousand, twenty", and thus it is an iban number.