20455004551 has 2 divisors, whose sum is σ = 20455004552. Its totient is φ = 20455004550.

The previous prime is 20455004543. The next prime is 20455004573. The reversal of 20455004551 is 15540055402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20455004551 - 2³ = 20455004543 is a prime.

It is a super-2 number, since 2×20455004551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20458004551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227502275 + 10227502276.

It is an arithmetic number, because the mean of its divisors is an integer number (10227502276).

Almost surely, 2^20455004551 is an apocalyptic number.

20455004551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455004551 is an equidigital number, since it uses as much as digits as its factorization.

20455004551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20000, while the sum is 31.

Adding to 20455004551 its reverse (15540055402), we get a palindrome (35995059953).

The spelling of 20455004551 in words is "twenty billion, four hundred fifty-five million, four thousand, five hundred fifty-one".