20774005543 has 4 divisors (see below), whose sum is σ = 20782248448. Its totient is φ = 20765762640.

The previous prime is 20774005529. The next prime is 20774005601. The reversal of 20774005543 is 34550047702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34550047702 = 2 ⋅17275023851.

It is a cyclic number.

It is not a de Polignac number, because 20774005543 - 2¹³ = 20773997351 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 (20774035543) 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, 4117671 + ... + 4122712.

It is an arithmetic number, because the mean of its divisors is an integer number (5195562112).

Almost surely, 2^20774005543 is an apocalyptic number.

20774005543 is a deficient number, since it is larger than the sum of its proper divisors (8242905).

20774005543 is an equidigital number, since it uses as much as digits as its factorization.

20774005543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242904.

The product of its (nonzero) digits is 117600, while the sum is 37.

The spelling of 20774005543 in words is "twenty billion, seven hundred seventy-four million, five thousand, five hundred forty-three".