20471381085 has 32 divisors (see below), whose sum is σ = 32978515968. Its totient is φ = 10843398720.

The previous prime is 20471381083. The next prime is 20471381089. The reversal of 20471381085 is 58018317402.

It is not a de Polignac number, because 20471381085 - 2¹ = 20471381083 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471381083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5648584 + ... + 5652206.

It is an arithmetic number, because the mean of its divisors is an integer number (1030578624).

Almost surely, 2^20471381085 is an apocalyptic number.

It is an amenable number.

20471381085 is a deficient number, since it is larger than the sum of its proper divisors (12507134883).

20471381085 is a wasteful number, since it uses less digits than its factorization.

20471381085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105.

The product of its (nonzero) digits is 53760, while the sum is 39.

Adding to 20471381085 its reverse (58018317402), we get a palindrome (78489698487).

The spelling of 20471381085 in words is "twenty billion, four hundred seventy-one million, three hundred eighty-one thousand, eighty-five".