20686772741 has 2 divisors, whose sum is σ = 20686772742. Its totient is φ = 20686772740.

The previous prime is 20686772699. The next prime is 20686772759. The reversal of 20686772741 is 14727768602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12917231716 + 7769541025 = 113654^2 + 88145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20686772741 - 2³⁴ = 3506903557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20686772741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20686772791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343386370 + 10343386371.

It is an arithmetic number, because the mean of its divisors is an integer number (10343386371).

Almost surely, 2^20686772741 is an apocalyptic number.

It is an amenable number.

20686772741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20686772741 is an equidigital number, since it uses as much as digits as its factorization.

20686772741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 20686772741 in words is "twenty billion, six hundred eighty-six million, seven hundred seventy-two thousand, seven hundred forty-one".