20511671221606 has 8 divisors (see below), whose sum is σ = 31288989999240. Its totient is φ = 10082007888528.

The previous prime is 20511671221549. The next prime is 20511671221609. The reversal of 20511671221606 is 60612217611502.

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

It is a super-2 number, since 2×20511671221606² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511671221609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86913860991 + ... + 86913861226.

It is an arithmetic number, because the mean of its divisors is an integer number (3911123749905).

Almost surely, 2^{20511671221606} is an apocalyptic number.

20511671221606 is a deficient number, since it is larger than the sum of its proper divisors (10777318777634).

20511671221606 is a wasteful number, since it uses less digits than its factorization.

20511671221606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173827722278.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 20511671221606 in words is "twenty trillion, five hundred eleven billion, six hundred seventy-one million, two hundred twenty-one thousand, six hundred six".