20059909 has 4 divisors (see below), whose sum is σ = 20751660. Its totient is φ = 19368160.

The previous prime is 20059903. The next prime is 20059927. The reversal of 20059909 is 90995002.

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 14607684 + 5452225 = 3822^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20059909 - 2³ = 20059901 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 (20059901) 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, 345832 + ... + 345889.

It is an arithmetic number, because the mean of its divisors is an integer number (5187915).

Almost surely, 2^20059909 is an apocalyptic number.

20059909 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20059909 is a deficient number, since it is larger than the sum of its proper divisors (691751).

20059909 is an equidigital number, since it uses as much as digits as its factorization.

20059909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691750.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 20059909 is about 4478.8289764178. The cubic root of 20059909 is about 271.7125215649.

The spelling of 20059909 in words is "twenty million, fifty-nine thousand, nine hundred nine".