20521161162008 has 32 divisors (see below), whose sum is σ = 41437645320960. Its totient is φ = 9471148515840.

The previous prime is 20521161162001. The next prime is 20521161162017. The reversal of 20521161162008 is 80026116112502.

It is a super-2 number, since 2×20521161162008² (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 (20521161162001) 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, 4808816 + ... + 8010432.

It is an arithmetic number, because the mean of its divisors is an integer number (1294926416280).

Almost surely, 2^{20521161162008} is an apocalyptic number.

It is an amenable number.

20521161162008 is an abundant number, since it is smaller than the sum of its proper divisors (20916484158952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20521161162008 is a wasteful number, since it uses less digits than its factorization.

20521161162008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263267 (or 3263263 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 20521161162008 in words is "twenty trillion, five hundred twenty-one billion, one hundred sixty-one million, one hundred sixty-two thousand, eight".