20552350405 has 8 divisors (see below), whose sum is σ = 24716321784. Its totient is φ = 16406212800.

The previous prime is 20552350393. The next prime is 20552350451. The reversal of 20552350405 is 50405325502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6892818529 + 13659531876 = 83023^2 + 116874^2 .

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

It is not a de Polignac number, because 20552350405 - 2¹⁹ = 20551826117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4455906 + ... + 4460515.

It is an arithmetic number, because the mean of its divisors is an integer number (3089540223).

Almost surely, 2^20552350405 is an apocalyptic number.

It is an amenable number.

20552350405 is a deficient number, since it is larger than the sum of its proper divisors (4163971379).

20552350405 is an equidigital number, since it uses as much as digits as its factorization.

20552350405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916887.

The product of its (nonzero) digits is 30000, while the sum is 31.

Adding to 20552350405 its reverse (50405325502), we get a palindrome (70957675907).

The spelling of 20552350405 in words is "twenty billion, five hundred fifty-two million, three hundred fifty thousand, four hundred five".