20740789 has 2 divisors, whose sum is σ = 20740790. Its totient is φ = 20740788.

The previous prime is 20740781. The next prime is 20740823. The reversal of 20740789 is 98704702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 400689 = 4510^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740789 - 2³ = 20740781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20740781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370394 + 10370395.

It is an arithmetic number, because the mean of its divisors is an integer number (10370395).

Almost surely, 2^20740789 is an apocalyptic number.

It is an amenable number.

20740789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740789 is an equidigital number, since it uses as much as digits as its factorization.

20740789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20740789 is about 4554.2056387476. The cubic root of 20740789 is about 274.7525664170.

The spelling of 20740789 in words is "twenty million, seven hundred forty thousand, seven hundred eighty-nine".