20789569 has 4 divisors (see below), whose sum is σ = 20948400. Its totient is φ = 20630740.

The previous prime is 20789567. The next prime is 20789603. The reversal of 20789569 is 96598702.

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 20789569 - 2¹ = 20789567 is a prime.

It is a super-2 number, since 2×20789569² = 864412358411522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20789563) 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, 79219 + ... + 79480.

It is an arithmetic number, because the mean of its divisors is an integer number (5237100).

Almost surely, 2^20789569 is an apocalyptic number.

It is an amenable number.

20789569 is a deficient number, since it is larger than the sum of its proper divisors (158831).

20789569 is a wasteful number, since it uses less digits than its factorization.

20789569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158830.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20789569 is about 4559.5579829628. The cubic root of 20789569 is about 274.9677934735.

The spelling of 20789569 in words is "twenty million, seven hundred eighty-nine thousand, five hundred sixty-nine".