20426004551 has 2 divisors, whose sum is σ = 20426004552. Its totient is φ = 20426004550.

The previous prime is 20426004461. The next prime is 20426004601. The reversal of 20426004551 is 15540062402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20426004551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20426004251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213002275 + 10213002276.

It is an arithmetic number, because the mean of its divisors is an integer number (10213002276).

Almost surely, 2^20426004551 is an apocalyptic number.

20426004551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426004551 is an equidigital number, since it uses as much as digits as its factorization.

20426004551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20426004551 its reverse (15540062402), we get a palindrome (35966066953).

The spelling of 20426004551 in words is "twenty billion, four hundred twenty-six million, four thousand, five hundred fifty-one".