20378775871 has 2 divisors, whose sum is σ = 20378775872. Its totient is φ = 20378775870.

The previous prime is 20378775853. The next prime is 20378775883. The reversal of 20378775871 is 17857787302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20378775871 - 2¹³ = 20378767679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20378775821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189387935 + 10189387936.

It is an arithmetic number, because the mean of its divisors is an integer number (10189387936).

Almost surely, 2^20378775871 is an apocalyptic number.

20378775871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378775871 is an equidigital number, since it uses as much as digits as its factorization.

20378775871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4609920, while the sum is 55.

The spelling of 20378775871 in words is "twenty billion, three hundred seventy-eight million, seven hundred seventy-five thousand, eight hundred seventy-one".