20889111 has 4 divisors (see below), whose sum is σ = 27852152. Its totient is φ = 13926072.

The previous prime is 20889109. The next prime is 20889137. The reversal of 20889111 is 11198802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20889111 - 2¹ = 20889109 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 (20889811) 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, 3481516 + ... + 3481521.

It is an arithmetic number, because the mean of its divisors is an integer number (6963038).

Almost surely, 2^20889111 is an apocalyptic number.

20889111 is a deficient number, since it is larger than the sum of its proper divisors (6963041).

20889111 is an equidigital number, since it uses as much as digits as its factorization.

20889111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963040.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 20889111 is about 4570.4606988793. The cubic root of 20889111 is about 275.4059503105.

The spelling of 20889111 in words is "twenty million, eight hundred eighty-nine thousand, one hundred eleven".