20050909 has 8 divisors (see below), whose sum is σ = 21263040. Its totient is φ = 18854496.

The previous prime is 20050879. The next prime is 20050913. The reversal of 20050909 is 90905002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20050909 - 2¹³ = 20042717 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 (20050969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (2657880).

Almost surely, 2^20050909 is an apocalyptic number.

It is an amenable number.

20050909 is a deficient number, since it is larger than the sum of its proper divisors (1212131).

20050909 is a wasteful number, since it uses less digits than its factorization.

20050909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7859.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 20050909 is about 4477.8241367879. The cubic root of 20050909 is about 271.6718803287.

The spelling of 20050909 in words is "twenty million, fifty thousand, nine hundred nine".