20420889 has 8 divisors (see below), whose sum is σ = 27807360. Its totient is φ = 13324176.

The previous prime is 20420867. The next prime is 20420891. The reversal of 20420889 is 98802402.

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

It is not a de Polignac number, because 20420889 - 2⁷ = 20420761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20420989) 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 7 ways as a sum of consecutive naturals, for example, 72274 + ... + 72555.

It is an arithmetic number, because the mean of its divisors is an integer number (3475920).

Almost surely, 2^20420889 is an apocalyptic number.

It is an amenable number.

20420889 is a deficient number, since it is larger than the sum of its proper divisors (7386471).

20420889 is a wasteful number, since it uses less digits than its factorization.

20420889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144879.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20420889 is about 4518.9477757549. The cubic root of 20420889 is about 273.3326728453.

The spelling of 20420889 in words is "twenty million, four hundred twenty thousand, eight hundred eighty-nine".