20854482277 has 4 divisors (see below), whose sum is σ = 20857748716. Its totient is φ = 20851215840.

The previous prime is 20854482227. The next prime is 20854482281. The reversal of 20854482277 is 77228445802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77228445802 = 2 ⋅38614222901.

It can be written as a sum of positive squares in 2 ways, for example, as 10482892996 + 10371589281 = 102386^2 + 101841^2 .

It is a cyclic number.

It is not a de Polignac number, because 20854482277 - 2¹⁵ = 20854449509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20854482277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854482217) 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, 1623624 + ... + 1636417.

It is an arithmetic number, because the mean of its divisors is an integer number (5214437179).

Almost surely, 2^20854482277 is an apocalyptic number.

It is an amenable number.

20854482277 is a deficient number, since it is larger than the sum of its proper divisors (3266439).

20854482277 is an equidigital number, since it uses as much as digits as its factorization.

20854482277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266438.

The product of its (nonzero) digits is 2007040, while the sum is 49.

The spelling of 20854482277 in words is "twenty billion, eight hundred fifty-four million, four hundred eighty-two thousand, two hundred seventy-seven".