20502131389 has 2 divisors, whose sum is σ = 20502131390. Its totient is φ = 20502131388.

The previous prime is 20502131381. The next prime is 20502131411. The reversal of 20502131389 is 98313120502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17851632100 + 2650499289 = 133610^2 + 51483^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502131389 - 2³ = 20502131381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20502131381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251065694 + 10251065695.

It is an arithmetic number, because the mean of its divisors is an integer number (10251065695).

Almost surely, 2^20502131389 is an apocalyptic number.

It is an amenable number.

20502131389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502131389 is an equidigital number, since it uses as much as digits as its factorization.

20502131389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 20502131389 in words is "twenty billion, five hundred two million, one hundred thirty-one thousand, three hundred eighty-nine".