20381677889 has 2 divisors, whose sum is σ = 20381677890. Its totient is φ = 20381677888.

The previous prime is 20381677873. The next prime is 20381677937. The reversal of 20381677889 is 98877618302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20112061489 + 269616400 = 141817^2 + 16420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20381677889 - 2⁴ = 20381677873 is a prime.

It is not a weakly prime, because it can be changed into another prime (20381677819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190838944 + 10190838945.

It is an arithmetic number, because the mean of its divisors is an integer number (10190838945).

Almost surely, 2^20381677889 is an apocalyptic number.

It is an amenable number.

20381677889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381677889 is an equidigital number, since it uses as much as digits as its factorization.

20381677889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 20381677889 in words is "twenty billion, three hundred eighty-one million, six hundred seventy-seven thousand, eight hundred eighty-nine".