20894109 has 4 divisors (see below), whose sum is σ = 27858816. Its totient is φ = 13929404.

The previous prime is 20894099. The next prime is 20894119. The reversal of 20894109 is 90149802.

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 an interprime number because it is at equal distance from previous prime (20894099) and next prime (20894119).

It is a cyclic number.

It is not a de Polignac number, because 20894109 - 2⁵ = 20894077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20894109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894119) 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, 3482349 + ... + 3482354.

It is an arithmetic number, because the mean of its divisors is an integer number (6964704).

Almost surely, 2^20894109 is an apocalyptic number.

It is an amenable number.

20894109 is a deficient number, since it is larger than the sum of its proper divisors (6964707).

20894109 is an equidigital number, since it uses as much as digits as its factorization.

20894109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6964706.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20894109 is about 4571.0074381913. The cubic root of 20894109 is about 275.4279134148.

The spelling of 20894109 in words is "twenty million, eight hundred ninety-four thousand, one hundred nine".