20419989 has 8 divisors (see below), whose sum is σ = 27324672. Its totient is φ = 13564320.

The previous prime is 20419981. The next prime is 20420011. The reversal of 20419989 is 98991402.

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

It is not a de Polignac number, because 20419989 - 2³ = 20419981 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20419989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20419981) 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, 11269 + ... + 12954.

It is an arithmetic number, because the mean of its divisors is an integer number (3415584).

Almost surely, 2^20419989 is an apocalyptic number.

It is an amenable number.

20419989 is a deficient number, since it is larger than the sum of its proper divisors (6904683).

20419989 is a wasteful number, since it uses less digits than its factorization.

20419989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24507.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 20419989 is about 4518.8481939539. The cubic root of 20419989 is about 273.3286572999.

The spelling of 20419989 in words is "twenty million, four hundred nineteen thousand, nine hundred eighty-nine".