20089911 has 4 divisors (see below), whose sum is σ = 26786552. Its totient is φ = 13393272.

The previous prime is 20089889. The next prime is 20089921. The reversal of 20089911 is 11998002.

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

It is not a de Polignac number, because 20089911 - 2¹⁵ = 20057143 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 (20089921) 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, 3348316 + ... + 3348321.

It is an arithmetic number, because the mean of its divisors is an integer number (6696638).

Almost surely, 2^20089911 is an apocalyptic number.

20089911 is a deficient number, since it is larger than the sum of its proper divisors (6696641).

20089911 is an equidigital number, since it uses as much as digits as its factorization.

20089911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696640.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 20089911 is about 4482.1770380028. The cubic root of 20089911 is about 271.8479136445.

The spelling of 20089911 in words is "twenty million, eighty-nine thousand, nine hundred eleven".