20205355505 has 8 divisors (see below), whose sum is σ = 24431514624. Its totient is φ = 16040892400.

The previous prime is 20205355501. The next prime is 20205355523. The reversal of 20205355505 is 50555350202.

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

It is not a de Polignac number, because 20205355505 - 2² = 20205355501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20205355501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15423281 + ... + 15424590.

It is an arithmetic number, because the mean of its divisors is an integer number (3053939328).

Almost surely, 2^20205355505 is an apocalyptic number.

It is an amenable number.

20205355505 is a deficient number, since it is larger than the sum of its proper divisors (4226159119).

20205355505 is a wasteful number, since it uses less digits than its factorization.

20205355505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30848007.

The product of its (nonzero) digits is 37500, while the sum is 32.

The spelling of 20205355505 in words is "twenty billion, two hundred five million, three hundred fifty-five thousand, five hundred five".