20510133073 has 4 divisors (see below), whose sum is σ = 20570994340. Its totient is φ = 20449271808.

The previous prime is 20510133047. The next prime is 20510133179. The reversal of 20510133073 is 37033101502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37033101502 = 2 ⋅18516550751.

It can be written as a sum of positive squares in 2 ways, for example, as 9441620224 + 11068512849 = 97168^2 + 105207^2 .

It is a cyclic number.

It is not a de Polignac number, because 20510133073 - 2⁵ = 20510133041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20510133673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30430128 + ... + 30430801.

It is an arithmetic number, because the mean of its divisors is an integer number (5142748585).

Almost surely, 2^20510133073 is an apocalyptic number.

It is an amenable number.

20510133073 is a deficient number, since it is larger than the sum of its proper divisors (60861267).

20510133073 is an equidigital number, since it uses as much as digits as its factorization.

20510133073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60861266.

The product of its (nonzero) digits is 1890, while the sum is 25.

Adding to 20510133073 its reverse (37033101502), we get a palindrome (57543234575).

The spelling of 20510133073 in words is "twenty billion, five hundred ten million, one hundred thirty-three thousand, seventy-three".