20377663447 has 2 divisors, whose sum is σ = 20377663448. Its totient is φ = 20377663446.

The previous prime is 20377663403. The next prime is 20377663451. The reversal of 20377663447 is 74436677302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20377663447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20377663447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20377660447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188831723 + 10188831724.

It is an arithmetic number, because the mean of its divisors is an integer number (10188831724).

Almost surely, 2^20377663447 is an apocalyptic number.

20377663447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377663447 is an equidigital number, since it uses as much as digits as its factorization.

20377663447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 49.

The spelling of 20377663447 in words is "twenty billion, three hundred seventy-seven million, six hundred sixty-three thousand, four hundred forty-seven".