20826789 has 4 divisors (see below), whose sum is σ = 27769056. Its totient is φ = 13884524.

The previous prime is 20826697. The next prime is 20826791. The reversal of 20826789 is 98762802.

It is a happy number.

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 not a de Polignac number, because 20826789 - 2¹³ = 20818597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20826789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20826889) 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, 3471129 + ... + 3471134.

It is an arithmetic number, because the mean of its divisors is an integer number (6942264).

Almost surely, 2^20826789 is an apocalyptic number.

It is an amenable number.

20826789 is a deficient number, since it is larger than the sum of its proper divisors (6942267).

20826789 is an equidigital number, since it uses as much as digits as its factorization.

20826789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6942266.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 20826789 is about 4563.6376937702. The cubic root of 20826789 is about 275.1317891737.

The spelling of 20826789 in words is "twenty million, eight hundred twenty-six thousand, seven hundred eighty-nine".