20244040 has 16 divisors (see below), whose sum is σ = 45549180. Its totient is φ = 8097600.

The previous prime is 20243989. The next prime is 20244041. The reversal of 20244040 is 4044202.

It can be written as a sum of positive squares in 2 ways, for example, as 17690436 + 2553604 = 4206^2 + 1598^2 .

It is not an unprimeable number, because it can be changed into a prime (20244041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253011 + ... + 253090.

Almost surely, 2^20244040 is an apocalyptic number.

20244040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20244040 is an abundant number, since it is smaller than the sum of its proper divisors (25305140).

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

20244040 is a wasteful number, since it uses less digits than its factorization.

20244040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506112 (or 506108 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20244040 is about 4499.3377290441. The cubic root of 20244040 is about 272.5413454646.

Adding to 20244040 its reverse (4044202), we get a palindrome (24288242).

The spelling of 20244040 in words is "twenty million, two hundred forty-four thousand, forty".