2021740 has 36 divisors (see below), whose sum is σ = 4941216. Its totient is φ = 692832.

The previous prime is 2021737. The next prime is 2021743. The reversal of 2021740 is 471202.

It is an interprime number because it is at equal distance from previous prime (2021737) and next prime (2021743).

It is not an unprimeable number, because it can be changed into a prime (2021743) 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, 52 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (137256).

2^2021740 is an apocalyptic number.

2021740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2470608).

2021740 is an abundant number, since it is smaller than the sum of its proper divisors (2919476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021740 is a wasteful number, since it uses less digits than its factorization.

2021740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 2077 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 2021740 is about 1421.8790384558. The cubic root of 2021740 is about 126.4469722074.

Adding to 2021740 its reverse (471202), we get a palindrome (2492942).

The spelling of 2021740 in words is "two million, twenty-one thousand, seven hundred forty".