20744156 has 6 divisors (see below), whose sum is σ = 36302280. Its totient is φ = 10372076.

The previous prime is 20744111. The next prime is 20744167. The reversal of 20744156 is 65144702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2593016 + ... + 2593023.

It is an arithmetic number, because the mean of its divisors is an integer number (6050380).

Almost surely, 2^20744156 is an apocalyptic number.

It is an amenable number.

20744156 is a deficient number, since it is larger than the sum of its proper divisors (15558124).

20744156 is a wasteful number, since it uses less digits than its factorization.

20744156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186043 (or 5186041 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20744156 is about 4554.5752820653. The cubic root of 20744156 is about 274.7674331262.

Adding to 20744156 its reverse (65144702), we get a palindrome (85888858).

The spelling of 20744156 in words is "twenty million, seven hundred forty-four thousand, one hundred fifty-six".