20778590453 has 2 divisors, whose sum is σ = 20778590454. Its totient is φ = 20778590452.

The previous prime is 20778590447. The next prime is 20778590467. The reversal of 20778590453 is 35409587702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18365128324 + 2413462129 = 135518^2 + 49127^2 .

It is a cyclic number.

It is not a de Polignac number, because 20778590453 - 2⁶ = 20778590389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20778590473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389295226 + 10389295227.

It is an arithmetic number, because the mean of its divisors is an integer number (10389295227).

Almost surely, 2^20778590453 is an apocalyptic number.

It is an amenable number.

20778590453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20778590453 is an equidigital number, since it uses as much as digits as its factorization.

20778590453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 20778590453 in words is "twenty billion, seven hundred seventy-eight million, five hundred ninety thousand, four hundred fifty-three".