20530420433 has 4 divisors (see below), whose sum is σ = 20559708468. Its totient is φ = 20501132400.

The previous prime is 20530420423. The next prime is 20530420441. The reversal of 20530420433 is 33402403502.

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 9114139024 + 11416281409 = 95468^2 + 106847^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530420433 - 2⁶ = 20530420369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20530420403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14642966 + ... + 14644367.

It is an arithmetic number, because the mean of its divisors is an integer number (5139927117).

Almost surely, 2^20530420433 is an apocalyptic number.

It is an amenable number.

20530420433 is a deficient number, since it is larger than the sum of its proper divisors (29288035).

20530420433 is an equidigital number, since it uses as much as digits as its factorization.

20530420433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29288034.

The product of its (nonzero) digits is 8640, while the sum is 26.

Adding to 20530420433 its reverse (33402403502), we get a palindrome (53932823935).

The spelling of 20530420433 in words is "twenty billion, five hundred thirty million, four hundred twenty thousand, four hundred thirty-three".