20553499999 has 4 divisors (see below), whose sum is σ = 21216516160. Its totient is φ = 19890483840.

The previous prime is 20553499961. The next prime is 20553500027. The reversal of 20553499999 is 99999435502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20553499999 - 2⁹ = 20553499487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20553499999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553499949) 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 in 3 ways as a sum of consecutive naturals, for example, 331508034 + ... + 331508095.

It is an arithmetic number, because the mean of its divisors is an integer number (5304129040).

Almost surely, 2^20553499999 is an apocalyptic number.

20553499999 is a deficient number, since it is larger than the sum of its proper divisors (663016161).

20553499999 is an equidigital number, since it uses as much as digits as its factorization.

20553499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663016160.

The product of its (nonzero) digits is 35429400, while the sum is 64.

The spelling of 20553499999 in words is "twenty billion, five hundred fifty-three million, four hundred ninety-nine thousand, nine hundred ninety-nine".