20742244 has 12 divisors (see below), whose sum is σ = 38434284. Its totient is φ = 9761024.

The previous prime is 20742229. The next prime is 20742247. The reversal of 20742244 is 44224702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8631844 + 12110400 = 2938^2 + 3480^2 .

It is not an unprimeable number, because it can be changed into a prime (20742247) 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, 152449 + ... + 152584.

It is an arithmetic number, because the mean of its divisors is an integer number (3202857).

Almost surely, 2^20742244 is an apocalyptic number.

It is an amenable number.

20742244 is a deficient number, since it is larger than the sum of its proper divisors (17692040).

20742244 is a wasteful number, since it uses less digits than its factorization.

20742244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305054 (or 305052 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 20742244 is about 4554.3653784034. The cubic root of 20742244 is about 274.7589910462.

Adding to 20742244 its reverse (44224702), we get a palindrome (64966946).

The spelling of 20742244 in words is "twenty million, seven hundred forty-two thousand, two hundred forty-four".