20451198988823 has 2 divisors, whose sum is σ = 20451198988824. Its totient is φ = 20451198988822.

The previous prime is 20451198988799. The next prime is 20451198988853. The reversal of 20451198988823 is 32888989115402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20451198988823 - 2²² = 20451194794519 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451198988853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225599494411 + 10225599494412.

It is an arithmetic number, because the mean of its divisors is an integer number (10225599494412).

Almost surely, 2^{20451198988823} is an apocalyptic number.

20451198988823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451198988823 is an equidigital number, since it uses as much as digits as its factorization.

20451198988823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79626240, while the sum is 68.

The spelling of 20451198988823 in words is "twenty trillion, four hundred fifty-one billion, one hundred ninety-eight million, nine hundred eighty-eight thousand, eight hundred twenty-three".