20427746865621 has 16 divisors (see below), whose sum is σ = 27664350096384. Its totient is φ = 13405127125104.

The previous prime is 20427746865619. The next prime is 20427746865637. The reversal of 20427746865621 is 12656864772402.

It is not a de Polignac number, because 20427746865621 - 2¹ = 20427746865619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427746865601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38026635 + ... + 38560088.

It is an arithmetic number, because the mean of its divisors is an integer number (1729021881024).

Almost surely, 2^{20427746865621} is an apocalyptic number.

It is an amenable number.

20427746865621 is a deficient number, since it is larger than the sum of its proper divisors (7236603230763).

20427746865621 is a wasteful number, since it uses less digits than its factorization.

20427746865621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76588120.

The product of its (nonzero) digits is 54190080, while the sum is 60.

The spelling of 20427746865621 in words is "twenty trillion, four hundred twenty-seven billion, seven hundred forty-six million, eight hundred sixty-five thousand, six hundred twenty-one".