20002161 has 8 divisors (see below), whose sum is σ = 27529984. Its totient is φ = 12904560.

The previous prime is 20002159. The next prime is 20002187. The reversal of 20002161 is 16120002.

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

It is not a de Polignac number, because 20002161 - 2¹ = 20002159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20002061) 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, 107446 + ... + 107631.

It is an arithmetic number, because the mean of its divisors is an integer number (3441248).

Almost surely, 2^20002161 is an apocalyptic number.

It is an amenable number.

20002161 is a deficient number, since it is larger than the sum of its proper divisors (7527823).

20002161 is a wasteful number, since it uses less digits than its factorization.

20002161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215111.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20002161 is about 4472.3775556185. The cubic root of 20002161 is about 271.4515377348.

Adding to 20002161 its reverse (16120002), we get a palindrome (36122163).

The spelling of 20002161 in words is "twenty million, two thousand, one hundred sixty-one".