20401635338171 has 8 divisors (see below), whose sum is σ = 21602783441664. Its totient is φ = 19200604113280.

The previous prime is 20401635338167. The next prime is 20401635338233. The reversal of 20401635338171 is 17183353610402.

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 20401635338171 - 2² = 20401635338167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401635338471) 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, 28860140 + ... + 29558601.

It is an arithmetic number, because the mean of its divisors is an integer number (2700347930208).

Almost surely, 2^{20401635338171} is an apocalyptic number.

20401635338171 is a deficient number, since it is larger than the sum of its proper divisors (1201148103493).

20401635338171 is a wasteful number, since it uses less digits than its factorization.

20401635338171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58439301.

The product of its (nonzero) digits is 362880, while the sum is 44.

Adding to 20401635338171 its reverse (17183353610402), we get a palindrome (37584988948573).

The spelling of 20401635338171 in words is "twenty trillion, four hundred one billion, six hundred thirty-five million, three hundred thirty-eight thousand, one hundred seventy-one".