20424490777 has 2 divisors, whose sum is σ = 20424490778. Its totient is φ = 20424490776.

The previous prime is 20424490769. The next prime is 20424490789. The reversal of 20424490777 is 77709442402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10609824016 + 9814666761 = 103004^2 + 99069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424490777 - 2³ = 20424490769 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424490747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212245388 + 10212245389.

It is an arithmetic number, because the mean of its divisors is an integer number (10212245389).

Almost surely, 2^20424490777 is an apocalyptic number.

It is an amenable number.

20424490777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424490777 is an equidigital number, since it uses as much as digits as its factorization.

20424490777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 46.

The spelling of 20424490777 in words is "twenty billion, four hundred twenty-four million, four hundred ninety thousand, seven hundred seventy-seven".