20585381189 has 2 divisors, whose sum is σ = 20585381190. Its totient is φ = 20585381188.

The previous prime is 20585381177. The next prime is 20585381197. The reversal of 20585381189 is 98118358502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19820416225 + 764964964 = 140785^2 + 27658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20585381189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20585381119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10292690594 + 10292690595.

It is an arithmetic number, because the mean of its divisors is an integer number (10292690595).

Almost surely, 2^20585381189 is an apocalyptic number.

It is an amenable number.

20585381189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20585381189 is an equidigital number, since it uses as much as digits as its factorization.

20585381189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 20585381189 in words is "twenty billion, five hundred eighty-five million, three hundred eighty-one thousand, one hundred eighty-nine".