20530870093 has 4 divisors (see below), whose sum is σ = 20531278588. Its totient is φ = 20530461600.

The previous prime is 20530870079. The next prime is 20530870111. The reversal of 20530870093 is 39007803502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10107889444 + 10422980649 = 100538^2 + 102093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20530870093 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 (20530870013) 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, 116208 + ... + 233593.

It is an arithmetic number, because the mean of its divisors is an integer number (5132819647).

Almost surely, 2^20530870093 is an apocalyptic number.

It is an amenable number.

20530870093 is a deficient number, since it is larger than the sum of its proper divisors (408495).

20530870093 is an equidigital number, since it uses as much as digits as its factorization.

20530870093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408494.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 20530870093 in words is "twenty billion, five hundred thirty million, eight hundred seventy thousand, ninety-three".