2020021 has 8 divisors (see below), whose sum is σ = 2139264.
Its totient is φ = 1903440.
The previous prime is 2020019. The next prime is 2020027. The reversal of 2020021 is 1200202.
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2020021 - 21 = 2020019 is a prime.
It is a Duffinian number.
2020021 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 2019986 and 2020013.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2020027) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1015 + ... + 2251.
It is an arithmetic number, because the mean of its divisors is an integer number (267408).
22020021 is an apocalyptic number.
It is an amenable number.
2020021 is a deficient number, since it is larger than the sum of its proper divisors (119243).
2020021 is a wasteful number, since it uses less digits than its factorization.
2020021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1331.
The product of its (nonzero) digits is 8, while the sum is 7.
The square root of 2020021 is about 1421.2744281102.
The cubic root of 2020021 is about 126.4111245416.
Adding to 2020021 its reverse (1200202), we get a palindrome (3220223).
The spelling of 2020021 in words is "two million, twenty thousand, twenty-one".