20772789 has 4 divisors (see below), whose sum is σ = 27697056. Its totient is φ = 13848524.

The previous prime is 20772781. The next prime is 20772797. The reversal of 20772789 is 98727702.

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 an interprime number because it is at equal distance from previous prime (20772781) and next prime (20772797).

It is a cyclic number.

It is not a de Polignac number, because 20772789 - 2³ = 20772781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20772789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3462129 + ... + 3462134.

It is an arithmetic number, because the mean of its divisors is an integer number (6924264).

Almost surely, 2^20772789 is an apocalyptic number.

It is an amenable number.

20772789 is a deficient number, since it is larger than the sum of its proper divisors (6924267).

20772789 is an equidigital number, since it uses as much as digits as its factorization.

20772789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924266.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 20772789 is about 4557.7175208650. The cubic root of 20772789 is about 274.8937948014.

The spelling of 20772789 in words is "twenty million, seven hundred seventy-two thousand, seven hundred eighty-nine".