20200709 has 4 divisors (see below), whose sum is σ = 21389004. Its totient is φ = 19012416.

The previous prime is 20200703. The next prime is 20200711. The reversal of 20200709 is 90700202.

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 14212900 + 5987809 = 3770^2 + 2447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200709 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 (20200703) 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, 594122 + ... + 594155.

It is an arithmetic number, because the mean of its divisors is an integer number (5347251).

Almost surely, 2^20200709 is an apocalyptic number.

It is an amenable number.

20200709 is a deficient number, since it is larger than the sum of its proper divisors (1188295).

20200709 is a wasteful number, since it uses less digits than its factorization.

20200709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188294.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 20200709 is about 4494.5198853715. The cubic root of 20200709 is about 272.3467544495.

The spelling of 20200709 in words is "twenty million, two hundred thousand, seven hundred nine".