20216636137057 has 8 divisors (see below), whose sum is σ = 20229132609792. Its totient is φ = 20204140110000.

The previous prime is 20216636137051. The next prime is 20216636137099. The reversal of 20216636137057 is 75073163661202.

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 20216636137057 - 2¹⁹ = 20216635612769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20216636137057.

It is not an unprimeable number, because it can be changed into a prime (20216636137051) 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, 167474832 + ... + 167595502.

It is an arithmetic number, because the mean of its divisors is an integer number (2528641576224).

Almost surely, 2^{20216636137057} is an apocalyptic number.

It is an amenable number.

20216636137057 is a deficient number, since it is larger than the sum of its proper divisors (12496472735).

20216636137057 is a wasteful number, since it uses less digits than its factorization.

20216636137057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222839.

The product of its (nonzero) digits is 1905120, while the sum is 49.

Adding to 20216636137057 its reverse (75073163661202), we get a palindrome (95289799798259).

The spelling of 20216636137057 in words is "twenty trillion, two hundred sixteen billion, six hundred thirty-six million, one hundred thirty-seven thousand, fifty-seven".