20790949 has 6 divisors (see below), whose sum is σ = 22086194. Its totient is φ = 19567680.

The previous prime is 20790947. The next prime is 20791007. The reversal of 20790949 is 94909702.

It can be written as a sum of positive squares in 3 ways, for example, as 4870849 + 15920100 = 2207^2 + 3990^2 .

It is not a de Polignac number, because 20790949 - 2¹ = 20790947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35682 + ... + 36259.

Almost surely, 2^20790949 is an apocalyptic number.

It is an amenable number.

20790949 is a deficient number, since it is larger than the sum of its proper divisors (1295245).

20790949 is an equidigital number, since it uses as much as digits as its factorization.

20790949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71975 (or 71958 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20790949 is about 4559.7093109101. The cubic root of 20790949 is about 274.9738774085.

The spelling of 20790949 in words is "twenty million, seven hundred ninety thousand, nine hundred forty-nine".