20761328718061 has 4 divisors (see below), whose sum is σ = 20761553468572. Its totient is φ = 20761103967552.

The previous prime is 20761328718049. The next prime is 20761328718073. The reversal of 20761328718061 is 16081782316702.

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

It is an interprime number because it is at equal distance from previous prime (20761328718049) and next prime (20761328718073).

It can be written as a sum of positive squares in 2 ways, for example, as 14622257096836 + 6139071621225 = 3823906^2 + 2477715^2 .

It is a cyclic number.

It is not a de Polignac number, because 20761328718061 - 2²⁹ = 20760791847149 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 (20761328713061) 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, 112236636 + ... + 112421461.

It is an arithmetic number, because the mean of its divisors is an integer number (5190388367143).

Almost surely, 2^{20761328718061} is an apocalyptic number.

It is an amenable number.

20761328718061 is a deficient number, since it is larger than the sum of its proper divisors (224750511).

20761328718061 is an equidigital number, since it uses as much as digits as its factorization.

20761328718061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224750510.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 20761328718061 in words is "twenty trillion, seven hundred sixty-one billion, three hundred twenty-eight million, seven hundred eighteen thousand, sixty-one".