20920523245 has 8 divisors (see below), whose sum is σ = 25110055800. Its totient is φ = 16732800000.

The previous prime is 20920523243. The next prime is 20920523279. The reversal of 20920523245 is 54232502902.

It can be written as a sum of positive squares in 4 ways, for example, as 10873067076 + 10047456169 = 104274^2 + 100237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20920523245 - 2¹ = 20920523243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20920523245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920523243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426756 + ... + 473245.

It is an arithmetic number, because the mean of its divisors is an integer number (3138756975).

Almost surely, 2^20920523245 is an apocalyptic number.

It is an amenable number.

20920523245 is a deficient number, since it is larger than the sum of its proper divisors (4189532555).

20920523245 is an equidigital number, since it uses as much as digits as its factorization.

20920523245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904655.

The product of its (nonzero) digits is 43200, while the sum is 34.

It can be divided in two parts, 209205 and 23245, that multiplied together give a square (4862970225 = 69735²).

The spelling of 20920523245 in words is "twenty billion, nine hundred twenty million, five hundred twenty-three thousand, two hundred forty-five".