20043555451 has 2 divisors, whose sum is σ = 20043555452. Its totient is φ = 20043555450.

The previous prime is 20043555443. The next prime is 20043555481. The reversal of 20043555451 is 15455534002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20043555451 - 2³ = 20043555443 is a prime.

It is not a weakly prime, because it can be changed into another prime (20043555421) 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, 10021777725 + 10021777726.

It is an arithmetic number, because the mean of its divisors is an integer number (10021777726).

Almost surely, 2^20043555451 is an apocalyptic number.

20043555451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043555451 is an equidigital number, since it uses as much as digits as its factorization.

20043555451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 20043555451 in words is "twenty billion, forty-three million, five hundred fifty-five thousand, four hundred fifty-one".