20205510355 has 4 divisors (see below), whose sum is σ = 24246612432. Its totient is φ = 16164408280.

The previous prime is 20205510331. The next prime is 20205510397. The reversal of 20205510355 is 55301550202.

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

It is not a de Polignac number, because 20205510355 - 2¹¹ = 20205508307 is a prime.

It is a Duffinian number.

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, 2020551031 + ... + 2020551040.

It is an arithmetic number, because the mean of its divisors is an integer number (6061653108).

Almost surely, 2^20205510355 is an apocalyptic number.

20205510355 is a deficient number, since it is larger than the sum of its proper divisors (4041102077).

20205510355 is an equidigital number, since it uses as much as digits as its factorization.

20205510355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041102076.

The product of its (nonzero) digits is 7500, while the sum is 28.

The spelling of 20205510355 in words is "twenty billion, two hundred five million, five hundred ten thousand, three hundred fifty-five".