20057744309 has 2 divisors, whose sum is σ = 20057744310. Its totient is φ = 20057744308.

The previous prime is 20057744261. The next prime is 20057744339. The reversal of 20057744309 is 90344775002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20057640625 + 103684 = 141625^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057744309 - 2²⁰ = 20056695733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20057744339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028872154 + 10028872155.

It is an arithmetic number, because the mean of its divisors is an integer number (10028872155).

Almost surely, 2^20057744309 is an apocalyptic number.

It is an amenable number.

20057744309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057744309 is an equidigital number, since it uses as much as digits as its factorization.

20057744309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The spelling of 20057744309 in words is "twenty billion, fifty-seven million, seven hundred forty-four thousand, three hundred nine".