20745244 has 24 divisors (see below), whose sum is σ = 39294080. Its totient is φ = 9526464.

The previous prime is 20745239. The next prime is 20745251. The reversal of 20745244 is 44254702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10702 + ... + 12490.

Almost surely, 2^20745244 is an apocalyptic number.

It is an amenable number.

20745244 is a deficient number, since it is larger than the sum of its proper divisors (18548836).

20745244 is a wasteful number, since it uses less digits than its factorization.

20745244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029 (or 2027 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 20745244 is about 4554.6947208348. The cubic root of 20745244 is about 274.7722367561.

Adding to 20745244 its reverse (44254702), we get a palindrome (64999946).

It can be divided in two parts, 207 and 45244, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 20745244 in words is "twenty million, seven hundred forty-five thousand, two hundred forty-four".