20530352405 has 8 divisors (see below), whose sum is σ = 24638215992. Its totient is φ = 16423086528.

The previous prime is 20530352389. The next prime is 20530352417. The reversal of 20530352405 is 50425303502.

It can be written as a sum of positive squares in 4 ways, for example, as 8127743716 + 12402608689 = 90154^2 + 111367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20530352405 - 2⁴ = 20530352389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70022 + ... + 214391.

It is an arithmetic number, because the mean of its divisors is an integer number (3079776999).

Almost surely, 2^20530352405 is an apocalyptic number.

It is an amenable number.

20530352405 is a deficient number, since it is larger than the sum of its proper divisors (4107863587).

20530352405 is a wasteful number, since it uses less digits than its factorization.

20530352405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298855.

The product of its (nonzero) digits is 18000, while the sum is 29.

Adding to 20530352405 its reverse (50425303502), we get a palindrome (70955655907).

The spelling of 20530352405 in words is "twenty billion, five hundred thirty million, three hundred fifty-two thousand, four hundred five".