20078889 has 8 divisors (see below), whose sum is σ = 27424992. Its totient is φ = 13059360.

The previous prime is 20078867. The next prime is 20078897. The reversal of 20078889 is 98887002.

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 20078889 - 2⁸ = 20078633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20078889.

It is not an unprimeable number, because it can be changed into a prime (20078189) 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, 81499 + ... + 81744.

It is an arithmetic number, because the mean of its divisors is an integer number (3428124).

Almost surely, 2^20078889 is an apocalyptic number.

It is an amenable number.

20078889 is a deficient number, since it is larger than the sum of its proper divisors (7346103).

20078889 is a wasteful number, since it uses less digits than its factorization.

20078889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163287.

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

The square root of 20078889 is about 4480.9473328750. The cubic root of 20078889 is about 271.7981895843.

The spelling of 20078889 in words is "twenty million, seventy-eight thousand, eight hundred eighty-nine".