2020643 has 4 divisors (see below), whose sum is σ = 2035320. Its totient is φ = 2005968.

The previous prime is 2020621. The next prime is 2020657. The reversal of 2020643 is 3460202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3460202 = 2 ⋅1730101.

It is a cyclic number.

It is not a de Polignac number, because 2020643 - 2⁸ = 2020387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7130 + ... + 7407.

It is an arithmetic number, because the mean of its divisors is an integer number (508830).

2^2020643 is an apocalyptic number.

2020643 is a deficient number, since it is larger than the sum of its proper divisors (14677).

2020643 is a wasteful number, since it uses less digits than its factorization.

2020643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14676.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 2020643 is about 1421.4932289673. The cubic root of 2020643 is about 126.4240979465.

Adding to 2020643 its reverse (3460202), we get a palindrome (5480845).

The spelling of 2020643 in words is "two million, twenty thousand, six hundred forty-three".