20827889 has 4 divisors (see below), whose sum is σ = 20843520. Its totient is φ = 20812260.

The previous prime is 20827861. The next prime is 20827897. The reversal of 20827889 is 98872802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20827889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20827589) 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, 5609 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (5210880).

Almost surely, 2^20827889 is an apocalyptic number.

It is an amenable number.

20827889 is a deficient number, since it is larger than the sum of its proper divisors (15631).

20827889 is a wasteful number, since it uses less digits than its factorization.

20827889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15630.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 20827889 is about 4563.7582100720. The cubic root of 20827889 is about 275.1366329295.

The spelling of 20827889 in words is "twenty million, eight hundred twenty-seven thousand, eight hundred eighty-nine".