20782375345 has 4 divisors (see below), whose sum is σ = 24938850420. Its totient is φ = 16625900272.

The previous prime is 20782375343. The next prime is 20782375363. The reversal of 20782375345 is 54357328702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54357328702 = 2 ⋅27178664351.

It can be written as a sum of positive squares in 2 ways, for example, as 10240630416 + 10541744929 = 101196^2 + 102673^2 .

It is a cyclic number.

It is not a de Polignac number, because 20782375345 - 2¹ = 20782375343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20782375295 and 20782375304.

It is not an unprimeable number, because it can be changed into a prime (20782375343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078237530 + ... + 2078237539.

It is an arithmetic number, because the mean of its divisors is an integer number (6234712605).

Almost surely, 2^20782375345 is an apocalyptic number.

It is an amenable number.

20782375345 is a deficient number, since it is larger than the sum of its proper divisors (4156475075).

20782375345 is an equidigital number, since it uses as much as digits as its factorization.

20782375345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156475074.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 20782375345 in words is "twenty billion, seven hundred eighty-two million, three hundred seventy-five thousand, three hundred forty-five".