20789249 has 16 divisors (see below), whose sum is σ = 24958080. Its totient is φ = 17107200.

The previous prime is 20789221. The next prime is 20789261. The reversal of 20789249 is 94298702.

It is a cyclic number.

It is not a de Polignac number, because 20789249 - 2²⁴ = 4012033 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20789269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1724 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (1559880).

Almost surely, 2^20789249 is an apocalyptic number.

It is an amenable number.

20789249 is a deficient number, since it is larger than the sum of its proper divisors (4168831).

20789249 is a wasteful number, since it uses less digits than its factorization.

20789249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20789249 is about 4559.5228917070. The cubic root of 20789249 is about 274.9663826675.

The spelling of 20789249 in words is "twenty million, seven hundred eighty-nine thousand, two hundred forty-nine".