20224187 has 4 divisors (see below), whose sum is σ = 20409840. Its totient is φ = 20038536.

The previous prime is 20224159. The next prime is 20224207. The reversal of 20224187 is 78142202.

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

It is a cyclic number.

It is not a de Polignac number, because 20224187 - 2¹⁸ = 19962043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20224117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92663 + ... + 92880.

It is an arithmetic number, because the mean of its divisors is an integer number (5102460).

Almost surely, 2^20224187 is an apocalyptic number.

20224187 is a deficient number, since it is larger than the sum of its proper divisors (185653).

20224187 is a wasteful number, since it uses less digits than its factorization.

20224187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185652.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20224187 is about 4497.1309742991. The cubic root of 20224187 is about 272.4522240401.

Adding to 20224187 its reverse (78142202), we get a palindrome (98366389).

It can be divided in two parts, 202 and 24187, that added together give a cube (24389 = 29³).

The spelling of 20224187 in words is "twenty million, two hundred twenty-four thousand, one hundred eighty-seven".