20111589 has 6 divisors (see below), whose sum is σ = 29050086. Its totient is φ = 13407720.

The previous prime is 20111579. The next prime is 20111603. The reversal of 20111589 is 98511102.

It can be written as a sum of positive squares in only one way, i.e., 17994564 + 2117025 = 4242^2 + 1455^2 .

It is not a de Polignac number, because 20111589 - 2¹⁶ = 20046053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117302 + ... + 1117319.

It is an arithmetic number, because the mean of its divisors is an integer number (4841681).

Almost surely, 2^20111589 is an apocalyptic number.

It is an amenable number.

20111589 is a deficient number, since it is larger than the sum of its proper divisors (8938497).

20111589 is a wasteful number, since it uses less digits than its factorization.

20111589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234627 (or 2234624 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 20111589 is about 4484.5946305101. The cubic root of 20111589 is about 271.9456575766.

It can be divided in two parts, 2011 and 1589, that added together give a square (3600 = 60²).

The spelling of 20111589 in words is "twenty million, one hundred eleven thousand, five hundred eighty-nine".