20544617245 has 4 divisors (see below), whose sum is σ = 24653540700. Its totient is φ = 16435693792.

The previous prime is 20544617237. The next prime is 20544617257. The reversal of 20544617245 is 54271644502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3342458596 + 17202158649 = 57814^2 + 131157^2 .

It is a cyclic number.

It is not a de Polignac number, because 20544617245 - 2³ = 20544617237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20544617198 and 20544617207.

It is a congruent number.

It is an unprimeable number.

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, 2054461720 + ... + 2054461729.

It is an arithmetic number, because the mean of its divisors is an integer number (6163385175).

Almost surely, 2^20544617245 is an apocalyptic number.

It is an amenable number.

20544617245 is a deficient number, since it is larger than the sum of its proper divisors (4108923455).

20544617245 is an equidigital number, since it uses as much as digits as its factorization.

20544617245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108923454.

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 20544617245 in words is "twenty billion, five hundred forty-four million, six hundred seventeen thousand, two hundred forty-five".