20705716437771 has 4 divisors (see below), whose sum is σ = 27607621917032. Its totient is φ = 13803810958512.

The previous prime is 20705716437751. The next prime is 20705716437877. The reversal of 20705716437771 is 17773461750702.

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

It is not a de Polignac number, because 20705716437771 - 2¹⁹ = 20705715913483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20705716437751) 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, 3450952739626 + ... + 3450952739631.

It is an arithmetic number, because the mean of its divisors is an integer number (6901905479258).

Almost surely, 2^{20705716437771} is an apocalyptic number.

20705716437771 is a deficient number, since it is larger than the sum of its proper divisors (6901905479261).

20705716437771 is an equidigital number, since it uses as much as digits as its factorization.

20705716437771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901905479260.

The product of its (nonzero) digits is 12101040, while the sum is 57.

The spelling of 20705716437771 in words is "twenty trillion, seven hundred five billion, seven hundred sixteen million, four hundred thirty-seven thousand, seven hundred seventy-one".