20087889 has 8 divisors (see below), whose sum is σ = 26817600. Its totient is φ = 13375056.

The previous prime is 20087869. The next prime is 20087927. The reversal of 20087889 is 98878002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20087889 - 2⁵ = 20087857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20087889.

It is not an unprimeable number, because it can be changed into a prime (20087819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (3352200).

Almost surely, 2^20087889 is an apocalyptic number.

It is an amenable number.

20087889 is a deficient number, since it is larger than the sum of its proper divisors (6729711).

20087889 is an equidigital number, since it uses as much as digits as its factorization.

20087889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8439.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 20087889 is about 4481.9514722942. The cubic root of 20087889 is about 271.8387930645.

The spelling of 20087889 in words is "twenty million, eighty-seven thousand, eight hundred eighty-nine".