210020020 has 24 divisors (see below), whose sum is σ = 504048384. Its totient is φ = 72006816.

The previous prime is 210020003. The next prime is 210020039. The reversal of 210020020 is 20020012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 210019985 and 210020012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749932 + ... + 750211.

It is an arithmetic number, because the mean of its divisors is an integer number (21002016).

Almost surely, 2^210020020 is an apocalyptic number.

210020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020020 is an abundant number, since it is smaller than the sum of its proper divisors (294028364).

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

210020020 is a wasteful number, since it uses less digits than its factorization.

210020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500159 (or 1500157 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 210020020 is about 14492.0674853521. The cubic root of 210020020 is about 594.4110831392.

Adding to 210020020 its reverse (20020012), we get a palindrome (230040032).

The spelling of 210020020 in words is "two hundred ten million, twenty thousand, twenty".