20509710545 has 8 divisors (see below), whose sum is σ = 24667212096. Its totient is φ = 16370728816.

The previous prime is 20509710527. The next prime is 20509710593. The reversal of 20509710545 is 54501790502.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20509710545 is a prime.

It is a super-4 number, since 4×20509710545⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20509710499 and 20509710508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4627517 + ... + 4631946.

It is an arithmetic number, because the mean of its divisors is an integer number (3083401512).

Almost surely, 2^20509710545 is an apocalyptic number.

It is an amenable number.

20509710545 is a deficient number, since it is larger than the sum of its proper divisors (4157501551).

20509710545 is an equidigital number, since it uses as much as digits as its factorization.

20509710545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9259911.

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 20509710545 in words is "twenty billion, five hundred nine million, seven hundred ten thousand, five hundred forty-five".