20894891 has 4 divisors (see below), whose sum is σ = 20904192. Its totient is φ = 20885592.

The previous prime is 20894869. The next prime is 20894911. The reversal of 20894891 is 19849802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20894891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20894191) 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, 1046 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (5226048).

Almost surely, 2^20894891 is an apocalyptic number.

20894891 is a deficient number, since it is larger than the sum of its proper divisors (9301).

20894891 is an equidigital number, since it uses as much as digits as its factorization.

20894891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9300.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 20894891 is about 4571.0929765210. The cubic root of 20894891 is about 275.4313495020.

The spelling of 20894891 in words is "twenty million, eight hundred ninety-four thousand, eight hundred ninety-one".