20075709 has 4 divisors (see below), whose sum is σ = 26767616. Its totient is φ = 13383804.

The previous prime is 20075701. The next prime is 20075749. The reversal of 20075709 is 90757002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20075709 - 2³ = 20075701 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 (20075701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3345949 + ... + 3345954.

It is an arithmetic number, because the mean of its divisors is an integer number (6691904).

Almost surely, 2^20075709 is an apocalyptic number.

It is an amenable number.

20075709 is a deficient number, since it is larger than the sum of its proper divisors (6691907).

20075709 is an equidigital number, since it uses as much as digits as its factorization.

20075709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6691906.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 20075709 is about 4480.5924831433. The cubic root of 20075709 is about 271.7838401205.

The spelling of 20075709 in words is "twenty million, seventy-five thousand, seven hundred nine".