20799389 has 8 divisors (see below), whose sum is σ = 22652280. Its totient is φ = 18982656.

The previous prime is 20799377. The next prime is 20799391. The reversal of 20799389 is 98399702.

It can be written as a sum of positive squares in 4 ways, for example, as 24025 + 20775364 = 155^2 + 4558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20799389 - 2⁸ = 20799133 is a prime.

It is a super-2 number, since 2×20799389² = 865229165546642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20799089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7832 + ... + 10145.

It is an arithmetic number, because the mean of its divisors is an integer number (2831535).

Almost surely, 2^20799389 is an apocalyptic number.

It is an amenable number.

20799389 is a deficient number, since it is larger than the sum of its proper divisors (1852891).

20799389 is a wasteful number, since it uses less digits than its factorization.

20799389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18079.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20799389 is about 4560.6347145984. The cubic root of 20799389 is about 275.0110805453.

The spelling of 20799389 in words is "twenty million, seven hundred ninety-nine thousand, three hundred eighty-nine".