20052709 has 4 divisors (see below), whose sum is σ = 20431116. Its totient is φ = 19674304.

The previous prime is 20052701. The next prime is 20052719. The reversal of 20052709 is 90725002.

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 14516100 + 5536609 = 3810^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 20052709 - 2³ = 20052701 is a prime.

It is a super-2 number, since 2×20052709² = 804222276477362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20052701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189124 + ... + 189229.

It is an arithmetic number, because the mean of its divisors is an integer number (5107779).

Almost surely, 2^20052709 is an apocalyptic number.

It is an amenable number.

20052709 is a deficient number, since it is larger than the sum of its proper divisors (378407).

20052709 is an equidigital number, since it uses as much as digits as its factorization.

20052709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378406.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20052709 is about 4478.0251227522. The cubic root of 20052709 is about 271.6800095487.

The spelling of 20052709 in words is "twenty million, fifty-two thousand, seven hundred nine".