20564042711251 has 8 divisors (see below), whose sum is σ = 22152313159200. Its totient is φ = 18976689550272.

The previous prime is 20564042711249. The next prime is 20564042711273. The reversal of 20564042711251 is 15211724046502.

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

It is a cyclic number.

It is not a de Polignac number, because 20564042711251 - 2¹ = 20564042711249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20564042711231) 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, 229275175 + ... + 229364848.

It is an arithmetic number, because the mean of its divisors is an integer number (2769039144900).

Almost surely, 2^{20564042711251} is an apocalyptic number.

20564042711251 is a deficient number, since it is larger than the sum of its proper divisors (1588270447949).

20564042711251 is a wasteful number, since it uses less digits than its factorization.

20564042711251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458643485.

The product of its (nonzero) digits is 134400, while the sum is 40.

Adding to 20564042711251 its reverse (15211724046502), we get a palindrome (35775766757753).

The spelling of 20564042711251 in words is "twenty trillion, five hundred sixty-four billion, forty-two million, seven hundred eleven thousand, two hundred fifty-one".