20464789 has 2 divisors, whose sum is σ = 20464790. Its totient is φ = 20464788.

The previous prime is 20464777. The next prime is 20464817. The reversal of 20464789 is 98746402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 6848689 = 3690^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 20464789 - 2⁵ = 20464757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20462789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232394 + 10232395.

It is an arithmetic number, because the mean of its divisors is an integer number (10232395).

Almost surely, 2^20464789 is an apocalyptic number.

It is an amenable number.

20464789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464789 is an equidigital number, since it uses as much as digits as its factorization.

20464789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20464789 is about 4523.8024934782. The cubic root of 20464789 is about 273.5283991602.

The spelling of 20464789 in words is "twenty million, four hundred sixty-four thousand, seven hundred eighty-nine".