2120200020 has 36 divisors (see below), whose sum is σ = 6431273940. Its totient is φ = 565386624.

The previous prime is 2120200013. The next prime is 2120200021. The reversal of 2120200020 is 200020212.

It can be written as a sum of positive squares in 2 ways, for example, as 675896004 + 1444304016 = 25998^2 + 38004^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 2120199975 and 2120200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120200021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5889265 + ... + 5889624.

Almost surely, 2^2120200020 is an apocalyptic number.

2120200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120200020 is an abundant number, since it is smaller than the sum of its proper divisors (4311073920).

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

2120200020 is a wasteful number, since it uses less digits than its factorization.

2120200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11778904 (or 11778899 counting only the distinct ones).

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

The square root of 2120200020 is about 46045.6297600543. The cubic root of 2120200020 is about 1284.6720577036.

Adding to 2120200020 its reverse (200020212), we get a palindrome (2320220232).

The spelling of 2120200020 in words is "two billion, one hundred twenty million, two hundred thousand, twenty".