2020921 has 16 divisors (see below), whose sum is σ = 2437120. Its totient is φ = 1639440.

The previous prime is 2020913. The next prime is 2020933. The reversal of 2020921 is 1290202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2020921 - 2³ = 2020913 is a prime.

2020921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2020895 and 2020904.

It is not an unprimeable number, because it can be changed into a prime (2020961) 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 15 ways as a sum of consecutive naturals, for example, 14470 + ... + 14608.

It is an arithmetic number, because the mean of its divisors is an integer number (152320).

2^2020921 is an apocalyptic number.

It is an amenable number.

2020921 is a deficient number, since it is larger than the sum of its proper divisors (416199).

2020921 is a wasteful number, since it uses less digits than its factorization.

2020921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2020921 is about 1421.5910101010. The cubic root of 2020921 is about 126.4298954884.

The spelling of 2020921 in words is "two million, twenty thousand, nine hundred twenty-one".