20572789 has 2 divisors, whose sum is σ = 20572790. Its totient is φ = 20572788.

The previous prime is 20572781. The next prime is 20572807. The reversal of 20572789 is 98727502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 2125764 = 4295^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20572789 - 2³ = 20572781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20572781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286394 + 10286395.

It is an arithmetic number, because the mean of its divisors is an integer number (10286395).

Almost surely, 2^20572789 is an apocalyptic number.

It is an amenable number.

20572789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20572789 is an equidigital number, since it uses as much as digits as its factorization.

20572789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20572789 is about 4535.7236467845. The cubic root of 20572789 is about 274.0087242147.

The spelling of 20572789 in words is "twenty million, five hundred seventy-two thousand, seven hundred eighty-nine".