20051550523 has 4 divisors (see below), whose sum is σ = 20380264528. Its totient is φ = 19722836520.

The previous prime is 20051550499. The next prime is 20051550557. The reversal of 20051550523 is 32505515002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32505515002 = 2 ⋅16252757501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20051550523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20051550491 and 20051550500.

It is not an unprimeable number, because it can be changed into a prime (20051550593) 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, 164356911 + ... + 164357032.

It is an arithmetic number, because the mean of its divisors is an integer number (5095066132).

Almost surely, 2^20051550523 is an apocalyptic number.

20051550523 is a deficient number, since it is larger than the sum of its proper divisors (328714005).

20051550523 is an equidigital number, since it uses as much as digits as its factorization.

20051550523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328714004.

The product of its (nonzero) digits is 7500, while the sum is 28.

The spelling of 20051550523 in words is "twenty billion, fifty-one million, five hundred fifty thousand, five hundred twenty-three".