20450187 has 12 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 13581168.

The previous prime is 20450149. The next prime is 20450207. The reversal of 20450187 is 78105402.

It is not a de Polignac number, because 20450187 - 2²⁰ = 19401611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20450187.

It is not an unprimeable number, because it can be changed into a prime (20450107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1803 + ... + 6644.

It is an arithmetic number, because the mean of its divisors is an integer number (2471040).

Almost surely, 2^20450187 is an apocalyptic number.

20450187 is a deficient number, since it is larger than the sum of its proper divisors (9202293).

20450187 is a wasteful number, since it uses less digits than its factorization.

20450187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8719 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20450187 is about 4522.1882977161. The cubic root of 20450187 is about 273.4633278482.

Adding to 20450187 its reverse (78105402), we get a palindrome (98555589).

The spelling of 20450187 in words is "twenty million, four hundred fifty thousand, one hundred eighty-seven".