20105161687 has 8 divisors (see below), whose sum is σ = 21662681040. Its totient is φ = 18549209280.

The previous prime is 20105161663. The next prime is 20105161697. The reversal of 20105161687 is 78616150102.

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 20105161687 - 2¹⁵ = 20105128919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105161627) 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, 365014 + ... + 416467.

It is an arithmetic number, because the mean of its divisors is an integer number (2707835130).

Almost surely, 2^20105161687 is an apocalyptic number.

20105161687 is a deficient number, since it is larger than the sum of its proper divisors (1557519353).

20105161687 is a wasteful number, since it uses less digits than its factorization.

20105161687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783473.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 20105161687 in words is "twenty billion, one hundred five million, one hundred sixty-one thousand, six hundred eighty-seven".