2020221 has 30 divisors (see below), whose sum is σ = 3517470. Its totient is φ = 1152144.

The previous prime is 2020181. The next prime is 2020223. The reversal of 2020221 is 1220202.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 99225 = 1386^2 + 315^2 .

It is not a de Polignac number, because 2020221 - 2⁹ = 2019709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

2020221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020223) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3715 + ... + 4223.

It is an arithmetic number, because the mean of its divisors is an integer number (117249).

2^2020221 is an apocalyptic number.

2020221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2020221 is a deficient number, since it is larger than the sum of its proper divisors (1497249).

2020221 is an equidigital number, since it uses as much as digits as its factorization.

2020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 519 counting only the distinct ones).

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

The square root of 2020221 is about 1421.3447857575. The cubic root of 2020221 is about 126.4152963449.

Adding to 2020221 its reverse (1220202), we get a palindrome (3240423).

The spelling of 2020221 in words is "two million, twenty thousand, two hundred twenty-one".