2020581 has 12 divisors (see below), whose sum is σ = 2931552. Its totient is φ = 1341096.

The previous prime is 2020561. The next prime is 2020591. The reversal of 2020581 is 1850202.

It is not a de Polignac number, because 2020581 - 2¹⁷ = 1889509 is a prime.

It is a super-2 number, since 2×2020581² = 8165495155122, which contains 22 as substring.

2020581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020511) 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 11 ways as a sum of consecutive naturals, for example, 2800 + ... + 3446.

It is an arithmetic number, because the mean of its divisors is an integer number (244296).

2^2020581 is an apocalyptic number.

It is an amenable number.

2020581 is a deficient number, since it is larger than the sum of its proper divisors (910971).

2020581 is a wasteful number, since it uses less digits than its factorization.

2020581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2020581 is about 1421.4714207468. The cubic root of 2020581 is about 126.4228048970.

Adding to 2020581 its reverse (1850202), we get a palindrome (3870783).

It can be divided in two parts, 2020 and 581, that added together give a square (2601 = 51²).

The spelling of 2020581 in words is "two million, twenty thousand, five hundred eighty-one".