20717231061 has 4 divisors (see below), whose sum is σ = 27622974752. Its totient is φ = 13811487372.

The previous prime is 20717231047. The next prime is 20717231089. The reversal of 20717231061 is 16013271702.

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 not a de Polignac number, because 20717231061 - 2⁹ = 20717230549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717231461) 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, 3452871841 + ... + 3452871846.

It is an arithmetic number, because the mean of its divisors is an integer number (6905743688).

Almost surely, 2^20717231061 is an apocalyptic number.

It is an amenable number.

20717231061 is a deficient number, since it is larger than the sum of its proper divisors (6905743691).

20717231061 is an equidigital number, since it uses as much as digits as its factorization.

20717231061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6905743690.

The product of its (nonzero) digits is 3528, while the sum is 30.

The spelling of 20717231061 in words is "twenty billion, seven hundred seventeen million, two hundred thirty-one thousand, sixty-one".