20208866801 has 4 divisors (see below), whose sum is σ = 20417205732. Its totient is φ = 20000527872.

The previous prime is 20208866789. The next prime is 20208866819. The reversal of 20208866801 is 10866880202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9272727025 + 10936139776 = 96295^2 + 104576^2 .

It is a cyclic number.

It is not a de Polignac number, because 20208866801 - 2¹⁰ = 20208865777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208866101) 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, 104169320 + ... + 104169513.

It is an arithmetic number, because the mean of its divisors is an integer number (5104301433).

Almost surely, 2^20208866801 is an apocalyptic number.

It is an amenable number.

20208866801 is a deficient number, since it is larger than the sum of its proper divisors (208338931).

20208866801 is an equidigital number, since it uses as much as digits as its factorization.

20208866801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208338930.

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 20208866801 in words is "twenty billion, two hundred eight million, eight hundred sixty-six thousand, eight hundred one".