20571065528449 has 8 divisors (see below), whose sum is σ = 20575604735840. Its totient is φ = 20566526832000.

The previous prime is 20571065528383. The next prime is 20571065528471. The reversal of 20571065528449 is 94482556017502.

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-20571065528449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20571065528393 and 20571065528402.

It is not an unprimeable number, because it can be changed into a prime (20571068528449) 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 7 ways as a sum of consecutive naturals, for example, 86804482 + ... + 87041140.

It is an arithmetic number, because the mean of its divisors is an integer number (2571950591980).

Almost surely, 2^{20571065528449} is an apocalyptic number.

It is an amenable number.

20571065528449 is a deficient number, since it is larger than the sum of its proper divisors (4539207391).

20571065528449 is a wasteful number, since it uses less digits than its factorization.

20571065528449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255471.

The product of its (nonzero) digits is 24192000, while the sum is 58.

The spelling of 20571065528449 in words is "twenty trillion, five hundred seventy-one billion, sixty-five million, five hundred twenty-eight thousand, four hundred forty-nine".