2020681 has 8 divisors (see below), whose sum is σ = 2235464. Its totient is φ = 1814400.

The previous prime is 2020679. The next prime is 2020687. The reversal of 2020681 is 1860202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46656 + 1974025 = 216^2 + 1405^2 .

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 2020681 - 2¹ = 2020679 is a prime.

It is a super-2 number, since 2×2020681² = 8166303407522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (279433).

2^2020681 is an apocalyptic number.

It is an amenable number.

2020681 is a deficient number, since it is larger than the sum of its proper divisors (214783).

2020681 is a wasteful number, since it uses less digits than its factorization.

2020681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2020681 is about 1421.5065951307. The cubic root of 2020681 is about 126.4248904476.

Adding to 2020681 its reverse (1860202), we get a palindrome (3880883).

It can be divided in two parts, 2020 and 681, that added together give a triangular number (2701 = T₇₃).

The spelling of 2020681 in words is "two million, twenty thousand, six hundred eighty-one".