20523130433 has 4 divisors (see below), whose sum is σ = 22101832788. Its totient is φ = 18944428080.

The previous prime is 20523130423. The next prime is 20523130447. The reversal of 20523130433 is 33403132502.

It is a happy number.

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 13978805824 + 6544324609 = 118232^2 + 80897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523130433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20523130423) 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, 789351158 + ... + 789351183.

It is an arithmetic number, because the mean of its divisors is an integer number (5525458197).

Almost surely, 2^20523130433 is an apocalyptic number.

It is an amenable number.

20523130433 is a deficient number, since it is larger than the sum of its proper divisors (1578702355).

20523130433 is a wasteful number, since it uses less digits than its factorization.

20523130433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578702354.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 20523130433 its reverse (33403132502), we get a palindrome (53926262935).

The spelling of 20523130433 in words is "twenty billion, five hundred twenty-three million, one hundred thirty thousand, four hundred thirty-three".