20531071177 has 4 divisors (see below), whose sum is σ = 20761757460. Its totient is φ = 20300384896.

The previous prime is 20531071133. The next prime is 20531071193. The reversal of 20531071177 is 77117013502.

It is a happy number.

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 4141694736 + 16389376441 = 64356^2 + 128021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531071177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531071777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115343008 + ... + 115343185.

It is an arithmetic number, because the mean of its divisors is an integer number (5190439365).

Almost surely, 2^20531071177 is an apocalyptic number.

It is an amenable number.

20531071177 is a deficient number, since it is larger than the sum of its proper divisors (230686283).

20531071177 is an equidigital number, since it uses as much as digits as its factorization.

20531071177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230686282.

The product of its (nonzero) digits is 10290, while the sum is 34.

Adding to 20531071177 its reverse (77117013502), we get a palindrome (97648084679).

The spelling of 20531071177 in words is "twenty billion, five hundred thirty-one million, seventy-one thousand, one hundred seventy-seven".