20289079 has 4 divisors (see below), whose sum is σ = 20298600. Its totient is φ = 20279560.

The previous prime is 20289053. The next prime is 20289091. The reversal of 20289079 is 97098202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20289079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289029) 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, 72 + ... + 6370.

It is an arithmetic number, because the mean of its divisors is an integer number (5074650).

Almost surely, 2^20289079 is an apocalyptic number.

20289079 is a deficient number, since it is larger than the sum of its proper divisors (9521).

20289079 is an equidigital number, since it uses as much as digits as its factorization.

20289079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20289079 is about 4504.3400182491. The cubic root of 20289079 is about 272.7433126896.

The spelling of 20289079 in words is "twenty million, two hundred eighty-nine thousand, seventy-nine".