20709244 has 12 divisors (see below), whose sum is σ = 36334368. Its totient is φ = 10328000.

The previous prime is 20709239. The next prime is 20709251. The reversal of 20709244 is 44290702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4852 + ... + 8059.

It is an arithmetic number, because the mean of its divisors is an integer number (3027864).

Almost surely, 2^20709244 is an apocalyptic number.

It is an amenable number.

20709244 is a deficient number, since it is larger than the sum of its proper divisors (15625124).

20709244 is a wasteful number, since it uses less digits than its factorization.

20709244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13316 (or 13314 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20709244 is about 4550.7410385562. The cubic root of 20709244 is about 274.6132038726.

Adding to 20709244 its reverse (44290702), we get a palindrome (64999946).

The spelling of 20709244 in words is "twenty million, seven hundred nine thousand, two hundred forty-four".