2000644 has 12 divisors (see below), whose sum is σ = 3567564. Its totient is φ = 981344.

The previous prime is 2000639. The next prime is 2000653. The reversal of 2000644 is 4460002.

2000644 = T₁₇ + T₁₈ + ... + T₂₂₈.

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 705600 = 1138^2 + 840^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507 + ... + 4930.

It is an arithmetic number, because the mean of its divisors is an integer number (297297).

2^2000644 is an apocalyptic number.

It is an amenable number.

2000644 is a deficient number, since it is larger than the sum of its proper divisors (1566920).

2000644 is a wasteful number, since it uses less digits than its factorization.

2000644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494 (or 9492 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2000644 is about 1414.4412324307. The cubic root of 2000644 is about 126.0056266909.

Adding to 2000644 its reverse (4460002), we get a palindrome (6460646).

The spelling of 2000644 in words is "two million, six hundred forty-four", and thus it is an aban number.