20116889 has 4 divisors (see below), whose sum is σ = 21664356. Its totient is φ = 18569424.

The previous prime is 20116871. The next prime is 20116891. The reversal of 20116889 is 98861102.

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 2544025 + 17572864 = 1595^2 + 4192^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116889 - 2²⁴ = 3339673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20116849) 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, 773714 + ... + 773739.

It is an arithmetic number, because the mean of its divisors is an integer number (5416089).

Almost surely, 2^20116889 is an apocalyptic number.

It is an amenable number.

20116889 is a deficient number, since it is larger than the sum of its proper divisors (1547467).

20116889 is a wasteful number, since it uses less digits than its factorization.

20116889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547466.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 20116889 is about 4485.1855034101. The cubic root of 20116889 is about 271.9695440597.

The spelling of 20116889 in words is "twenty million, one hundred sixteen thousand, eight hundred eighty-nine".