20881254209 has 4 divisors (see below), whose sum is σ = 21366864816. Its totient is φ = 20395643604.

The previous prime is 20881254193. The next prime is 20881254227. The reversal of 20881254209 is 90245218802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20881254209 - 2⁴ = 20881254193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20881254259) 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, 242805239 + ... + 242805324.

It is an arithmetic number, because the mean of its divisors is an integer number (5341716204).

Almost surely, 2^20881254209 is an apocalyptic number.

It is an amenable number.

20881254209 is a deficient number, since it is larger than the sum of its proper divisors (485610607).

20881254209 is an equidigital number, since it uses as much as digits as its factorization.

20881254209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485610606.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 20881254209 in words is "twenty billion, eight hundred eighty-one million, two hundred fifty-four thousand, two hundred nine".