20288444377 has 2 divisors, whose sum is σ = 20288444378. Its totient is φ = 20288444376.

The previous prime is 20288444369. The next prime is 20288444413. The reversal of 20288444377 is 77344488202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18503888841 + 1784555536 = 136029^2 + 42244^2 .

It is a cyclic number.

It is not a de Polignac number, because 20288444377 - 2³ = 20288444369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20288444377.

It is not a weakly prime, because it can be changed into another prime (20288444177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144222188 + 10144222189.

It is an arithmetic number, because the mean of its divisors is an integer number (10144222189).

Almost surely, 2^20288444377 is an apocalyptic number.

It is an amenable number.

20288444377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20288444377 is an equidigital number, since it uses as much as digits as its factorization.

20288444377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2408448, while the sum is 49.

The spelling of 20288444377 in words is "twenty billion, two hundred eighty-eight million, four hundred forty-four thousand, three hundred seventy-seven".