20563341811 has 4 divisors (see below), whose sum is σ = 20597557624. Its totient is φ = 20529126000.

The previous prime is 20563341787. The next prime is 20563341839. The reversal of 20563341811 is 11814336502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11814336502 = 2 ⋅5907168251.

It is a cyclic number.

It is not a de Polignac number, because 20563341811 - 2¹³ = 20563333619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20563341511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17107005 + ... + 17108206.

It is an arithmetic number, because the mean of its divisors is an integer number (5149389406).

Almost surely, 2^20563341811 is an apocalyptic number.

20563341811 is a deficient number, since it is larger than the sum of its proper divisors (34215813).

20563341811 is an equidigital number, since it uses as much as digits as its factorization.

20563341811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34215812.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20563341811 in words is "twenty billion, five hundred sixty-three million, three hundred forty-one thousand, eight hundred eleven".