210020002020 has 72 divisors (see below), whose sum is σ = 643628362104. Its totient is φ = 55427954688.

The previous prime is 210020002019. The next prime is 210020002037. The reversal of 210020002020 is 20200020012.

It can be written as a sum of positive squares in 4 ways, for example, as 19430129664 + 190589872356 = 139392^2 + 436566^2 .

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 = 210020001993 and 210020002011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5996859 + ... + 6031778.

It is an arithmetic number, because the mean of its divisors is an integer number (8939282807).

Almost surely, 2^210020002020 is an apocalyptic number.

210020002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020002020 is an abundant number, since it is smaller than the sum of its proper divisors (433608360084).

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

210020002020 is a wasteful number, since it uses less digits than its factorization.

210020002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12028749 (or 12028744 counting only the distinct ones).

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

Adding to 210020002020 its reverse (20200020012), we get a palindrome (230220022032).

The spelling of 210020002020 in words is "two hundred ten billion, twenty million, two thousand, twenty".