20591889 has 8 divisors (see below), whose sum is σ = 27478560. Its totient is φ = 13716576.

The previous prime is 20591873. The next prime is 20591891. The reversal of 20591889 is 98819502.

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 20591889 - 2⁴ = 20591873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20591889.

It is not an unprimeable number, because it can be changed into a prime (20591689) 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 7 ways as a sum of consecutive naturals, for example, 3277 + ... + 7205.

It is an arithmetic number, because the mean of its divisors is an integer number (3434820).

Almost surely, 2^20591889 is an apocalyptic number.

It is an amenable number.

20591889 is a deficient number, since it is larger than the sum of its proper divisors (6886671).

20591889 is a wasteful number, since it uses less digits than its factorization.

20591889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 20591889 is about 4537.8286657828. The cubic root of 20591889 is about 274.0934955411.

The spelling of 20591889 in words is "twenty million, five hundred ninety-one thousand, eight hundred eighty-nine".