20439841057 has 2 divisors, whose sum is σ = 20439841058. Its totient is φ = 20439841056.

The previous prime is 20439841049. The next prime is 20439841061. The reversal of 20439841057 is 75014893402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15072227361 + 5367613696 = 122769^2 + 73264^2 .

It is a cyclic number.

It is not a de Polignac number, because 20439841057 - 2³ = 20439841049 is a prime.

It is a super-3 number, since 3×20439841057³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20439841007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219920528 + 10219920529.

It is an arithmetic number, because the mean of its divisors is an integer number (10219920529).

Almost surely, 2^20439841057 is an apocalyptic number.

It is an amenable number.

20439841057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439841057 is an equidigital number, since it uses as much as digits as its factorization.

20439841057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20439841057 in words is "twenty billion, four hundred thirty-nine million, eight hundred forty-one thousand, fifty-seven".