20520444355 has 4 divisors (see below), whose sum is σ = 24624533232. Its totient is φ = 16416355480.

The previous prime is 20520444349. The next prime is 20520444379. The reversal of 20520444355 is 55344402502.

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

It is not a de Polignac number, because 20520444355 - 2¹¹ = 20520442307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20520444355.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052044431 + ... + 2052044440.

It is an arithmetic number, because the mean of its divisors is an integer number (6156133308).

Almost surely, 2^20520444355 is an apocalyptic number.

20520444355 is a deficient number, since it is larger than the sum of its proper divisors (4104088877).

20520444355 is an equidigital number, since it uses as much as digits as its factorization.

20520444355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104088876.

The product of its (nonzero) digits is 96000, while the sum is 34.

Adding to 20520444355 its reverse (55344402502), we get a palindrome (75864846857).

The spelling of 20520444355 in words is "twenty billion, five hundred twenty million, four hundred forty-four thousand, three hundred fifty-five".