2100000020 has 12 divisors (see below), whose sum is σ = 4410000084. Its totient is φ = 840000000.

The previous prime is 2100000017. The next prime is 2100000053. The reversal of 2100000020 is 200000012.

It can be written as a sum of positive squares in 2 ways, for example, as 1300467844 + 799532176 = 36062^2 + 28276^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52499981 + ... + 52500020.

It is an arithmetic number, because the mean of its divisors is an integer number (367500007).

Almost surely, 2^2100000020 is an apocalyptic number.

2100000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100000020 is an abundant number, since it is smaller than the sum of its proper divisors (2310000064).

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

2100000020 is a wasteful number, since it uses less digits than its factorization.

2100000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105000010 (or 105000008 counting only the distinct ones).

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

The square root of 2100000020 is about 45825.7571677763. The cubic root of 2100000020 is about 1280.5791690528.

Adding to 2100000020 its reverse (200000012), we get a palindrome (2300000032).

The spelling of 2100000020 in words is "two billion, one hundred million, twenty", and thus it is an aban number.