20455889 has 4 divisors (see below), whose sum is σ = 20559924. Its totient is φ = 20351856.

The previous prime is 20455873. The next prime is 20455891. The reversal of 20455889 is 98855402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17497489 + 2958400 = 4183^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455889 - 2⁴ = 20455873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20455829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51722 + ... + 52115.

It is an arithmetic number, because the mean of its divisors is an integer number (5139981).

Almost surely, 2^20455889 is an apocalyptic number.

It is an amenable number.

20455889 is a deficient number, since it is larger than the sum of its proper divisors (104035).

20455889 is a wasteful number, since it uses less digits than its factorization.

20455889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104034.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 20455889 is about 4522.8187007661. The cubic root of 20455889 is about 273.4887415196.

The spelling of 20455889 in words is "twenty million, four hundred fifty-five thousand, eight hundred eighty-nine".