20387980841 has 2 divisors, whose sum is σ = 20387980842. Its totient is φ = 20387980840.

The previous prime is 20387980787. The next prime is 20387980843. The reversal of 20387980841 is 14808978302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15896166400 + 4491814441 = 126080^2 + 67021^2 .

It is a cyclic number.

It is not a de Polignac number, because 20387980841 - 2⁶ = 20387980777 is a prime.

Together with 20387980843, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20387980841.

It is not a weakly prime, because it can be changed into another prime (20387980843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193990420 + 10193990421.

It is an arithmetic number, because the mean of its divisors is an integer number (10193990421).

Almost surely, 2^20387980841 is an apocalyptic number.

It is an amenable number.

20387980841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387980841 is an equidigital number, since it uses as much as digits as its factorization.

20387980841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 20387980841 in words is "twenty billion, three hundred eighty-seven million, nine hundred eighty thousand, eight hundred forty-one".