20534550551 has 8 divisors (see below), whose sum is σ = 20674366944. Its totient is φ = 20394784800.

The previous prime is 20534550539. The next prime is 20534550559. The reversal of 20534550551 is 15505543502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20534550551 - 2²² = 20530356247 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 (20534550559) 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 7 ways as a sum of consecutive naturals, for example, 1177145 + ... + 1194461.

It is an arithmetic number, because the mean of its divisors is an integer number (2584295868).

Almost surely, 2^20534550551 is an apocalyptic number.

20534550551 is a deficient number, since it is larger than the sum of its proper divisors (139816393).

20534550551 is a wasteful number, since it uses less digits than its factorization.

20534550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25321.

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 20534550551 in words is "twenty billion, five hundred thirty-four million, five hundred fifty thousand, five hundred fifty-one".