20304500551 has 4 divisors (see below), whose sum is σ = 20590479504. Its totient is φ = 20018521600.

The previous prime is 20304500483. The next prime is 20304500599. The reversal of 20304500551 is 15500540302.

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 20304500551 - 2⁹ = 20304500039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302500551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142989370 + ... + 142989511.

It is an arithmetic number, because the mean of its divisors is an integer number (5147619876).

Almost surely, 2^20304500551 is an apocalyptic number.

20304500551 is a deficient number, since it is larger than the sum of its proper divisors (285978953).

20304500551 is an equidigital number, since it uses as much as digits as its factorization.

20304500551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285978952.

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 20304500551 in words is "twenty billion, three hundred four million, five hundred thousand, five hundred fifty-one".