20799529 has 4 divisors (see below), whose sum is σ = 20824020. Its totient is φ = 20775040.

The previous prime is 20799503. The next prime is 20799563. The reversal of 20799529 is 92599702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3385600 + 17413929 = 1840^2 + 4173^2 .

It is a cyclic number.

It is not a de Polignac number, because 20799529 - 2⁵ = 20799497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20799589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10924 + ... + 12685.

It is an arithmetic number, because the mean of its divisors is an integer number (5206005).

Almost surely, 2^20799529 is an apocalyptic number.

It is an amenable number.

20799529 is a deficient number, since it is larger than the sum of its proper divisors (24491).

20799529 is an equidigital number, since it uses as much as digits as its factorization.

20799529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24490.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 20799529 is about 4560.6500633133. The cubic root of 20799529 is about 275.0116975740.

The spelling of 20799529 in words is "twenty million, seven hundred ninety-nine thousand, five hundred twenty-nine".