20557944367 has 2 divisors, whose sum is σ = 20557944368. Its totient is φ = 20557944366.

The previous prime is 20557944353. The next prime is 20557944389. The reversal of 20557944367 is 76344975502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20557944367 - 2¹⁵ = 20557911599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20557944307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278972183 + 10278972184.

It is an arithmetic number, because the mean of its divisors is an integer number (10278972184).

Almost surely, 2^20557944367 is an apocalyptic number.

20557944367 is a deficient number, since it is larger than the sum of its proper divisors (1).

20557944367 is an equidigital number, since it uses as much as digits as its factorization.

20557944367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 20557944367 in words is "twenty billion, five hundred fifty-seven million, nine hundred forty-four thousand, three hundred sixty-seven".