2040450640 has 20 divisors (see below), whose sum is σ = 4744047924. Its totient is φ = 816180224.

The previous prime is 2040450593. The next prime is 2040450673. The reversal of 2040450640 is 460540402.

It can be written as a sum of positive squares in 2 ways, for example, as 262310416 + 1778140224 = 16196^2 + 42168^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12752737 + ... + 12752896.

Almost surely, 2^2040450640 is an apocalyptic number.

2040450640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2040450640 is an abundant number, since it is smaller than the sum of its proper divisors (2703597284).

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

2040450640 is a wasteful number, since it uses less digits than its factorization.

2040450640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25505646 (or 25505640 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 2040450640 is about 45171.3475557239. The cubic root of 2040450640 is about 1268.3585216202.

The spelling of 2040450640 in words is "two billion, forty million, four hundred fifty thousand, six hundred forty".